Florida magnetic traverse F (Cont'd. )

R.I. 3810

Vertical |, Vertical
Station magnetic Station magnetic
Miles Road number in‘ensity)| Miles Road number intensity
158 ~ LST 551 |, ke TES 195
138 Stations 137, 138, 139 stake | a7 146 80h
station markers put in 148 147 766
139 138 670 |; 148.4 Junction Fla. 29 :
1ho 139 713. (|; 157.7 Junction Fla. 8 & 29 in
. Okeechobee
1a 1ho 708
he wa 703
143 ihe 7OL
wah 145 723
145 ae 772
Florida magnetic traverse G
Vertical |} Vertical
Station magnetic Station magnetic
Miles Road number intensity|| Miles Road number intensity
0 On beach at Rio Mar 13° “Fla. 30 wh 367
0 1 45503, 14 do. 15 351
1 2 526 |; 15 do. 16 372
1 East of Vero Beach ; 16 do. 17 388
1,8 Mainland i 17 do. 18 380
\ :
2 3 “512 |! 18 do. 19 352
3 4 453 Il a9 do. 20 525
3 Inside city limits of Vero 20 do. el 252
Beach . el do. 22 362
3.1 R.R. crossing i} 22 do. 25 366
4 5 470 | :
23 do. eh 371
y Fla. 30, west edge of Vero oh do. 25 360
Beach 25 de. 26 335
5 Fla. 30 6 451 26 do. 27 331
6 do. 7 HUG 26 Road curves to NW.
7 de. 8. . ae)
8 do. 9. - 430 27 = Fla. 30 28 - 45331
. a do. 29 331
9 do. 10 ALG 29 do. 30 377
10 do. ann YAS 30 do. 3a 412
11° do. 12 438 31 do; 3e 500
12 do. 13 399 .
12 Edge of fill; drainage ditch

503

both sides of road

-21-


R.I. 3810

Florida magnetic traverse E (Cont'd.)

Vertical Vertical
Station magnetic Station magnetic
Miles Road number _ intensity ||Miles Road. number intensity
69 Fla. & 60 OuS %- 5 Side road
61 do. él 985 96 Fla. 18 96 999
62 do. 62 45009 oT do. oT 45039
63 do. 63 037 98 do. 98° 067
64.2 do. 64 058 99 do. 99 068
65 do. 65 070 100 do. 100 086
66 66 088 101 do. 101 076
66-67 Distinct elevation rise 101.2 Junction Fla. 18 & 2
67 Fla. 8 67 095 102 102’ 039
68 do. 68 O91 102 Entering Arcadia
69 do. 69 075 102.3 Fla, 18 & U.S. 17
70 do. 70 056 102.4 R.R.
70.1 R.R. corssing Junction Fla. 67, |) 103 Leaving Arcadia"
8, 18; Fla. 18 Highway 103 103 058
71 Fla. 18 71 018 103.5 R.R. crossing ~
72 do. 72 490 103.8 Junction Fla. 18 & 220
73 do. 13 957 104 Fla. 220 10k “095
Th do. 74 932 105.2 Side road south
15 do. 75 905 105.5 Fla. 220 105 087
74-75 Distinct elevation drop 106 106 081
76 Fla. 18 76 871 107 do. 107 45058
77 “do. 71 835 108 do. 108 - 036
78 do. 78 808 109 do. 109 019
79 do. 19 778 110 do. 1210 033
80 do. 80 Th 110.3 Side road south
81 do. 81 4YT1E 111s Fla. 220 1 036
82 do. 82 695 1 Horse Creek
83 do. 83 676 112 Fla. 220 112 02k
8y do, 8h 663 113 do. 113 013
85 do. 85 662 14 do. 114 44993
86 do. 86 665 115 do. 115 966
87 do. 87 683 116 do. 116 939
88 do. 88 696 117 do. 117 919
89 do. 89 732 118 do. 118 879
90 do. 90 115 1g do. 119 846
91 do. 91 815 119.4 R.R. crossing
92 do. 92 862 120 Fle. 220 120 815
93 do. 93. 906 121 do. 121 768
4 do. oh 48 122 do. 122 720
95 do. 95 970 123 do. 123 673

503 -17-


R.I. 3810

Florida magnetic traverse H (Cont'd.)

Vertical Vertical
Station magnetic Station magnetic
Miles Road number intensity |} Miles Road number intensity
1el U.S. 192 116 906 iho U.S. 192 135 . 650
122 do. 117 883 AL do. 136 653
12% do. 118 872 ike do. 137 637
lek do. 119 876 1435 do. 138 643
1eh.4 Junction Fla. 29; R.R. wy do. 139 643
crossing
14,2 to 146.5 Swamp, metal guard
125. U.S. 192 120 88h rail both sides of
126 do. 121 879 road
127 do. 122 915 145.5 St. Johns River
128 do. 123 916 146.5 U.S. 192 140 45625
129 do. lek 893 148 do. U1 600
130 do. 125 862 1g do. 142 579
131 do. 126 854 || 150 do. 143 58
132 do. 127 815 151 do. anal 535
135 do. 128 805 152 do. 145 52h
13h do. 129 777 153 do. 1h6 525
135 do. 130 754 fl 15h do. 147 512
136 do. 131 715 | 54.8 R.R. crossing; Melbourne, Fla.
137 do. 132 661 154.9 Junction U.S. 1
138 do. 133 660 155 Shore line 148 kok
139 do. 13h 661 157.5 149 552
157.5 Beach Indiatlantic; end of line H
Florida magnetic traverse I
Vertical Vertical
Station magnetic Station magnetic
Miles Road number _ intensity || Miles Road number __ intensity
to) At a point approximately 200 fs) Fla. 119 9 057
ft. east U.S. C&G.S. tri- 9 do. 10 058
angulation station at 9.2 Side road north
Titusville Beach 10 Fla. 119 iL 050
) Fla. 119 1 4.6088 10.8 do. 12 027
1 do. 2 9080
1.6 Sand road south 10.9-12.4 Bridge
2 Fla. 119 3 095 12.4 13 013
3 do. 4 085 12.4 Bridge ends; junction Fla. 119
& U.S. 1; road jogs south 0.2
y do. 5 o7. st mile then west, on Fla. 119
5 do. 6 osu
6 do. T ou7 |
6.1 Pavement begins |
7 Fle. 119 8 oho!

503 - 26 -




R.I. 3810

Florida magnetic traverse L (Cont'd. )

Vertical Vertical
Station magnetic Station magnetic
Miles Roar number intensity || Miles Road number intensity
25 Fla. 13 26 859 55.9 Cross road; village
26 do. 27 873 56 Fla. 47a 57 A7hok
eT do. 28 882 57 ao. 58 ko
28 do. 29 896 58 59 Lok
2g do. 20 918 58.9 R.R. crossing; irvine
30 do. 31 46947 59 60 451
31 do. 32 95k 60 61 4s
32 do. 33 973 61 62 463
32.4 High-tension line 61.4 Junction Fla. #7A & U.S. 441
33 3h 965 62 Fla. 47a 63 472
33.5 Junction Fla. 13, U.S. 19 & 2.2 R.R. crossing
Fla. 19 63 Fla. 47a 64 481
33.6 Bronson 6k do. 65 459
34 Fla. 19 35 966 65 do. 66 462
3 do. 36 47016 66 do. 67 466
36 do. 37 050 66.7 Side road
37 do. 38 O71 67 Fla. 47a 68 Who
38 do. 39 090 67.8 Junction Fla. 31 & 47A; Citra
39 do. ho 122 68 la. 47a 69 417
ho do. an 153 68.1 R.R. crossing
AL do. ho 162 69 Fla. 47A 70 WOT
ke do. 4a 195 70 do. 7 399
43, do. dh 221 7 do. 72 390
yy do. 45 250 72 ao. 73 380
45 do. 46 251 73 do. Te 403
45.8 Junction U.S. 41 &@ 19 & 7h do. 75 yor
Fla. 19 75 do. 76 426
46 47a Fla. 19 47 311 16 an. vai yer
46.5 RR. crossing; Williston (7 do. 78 4es
46.9 R.R. crossing 78 do. 79 her
47 Fla. 19 48 302 19 do. 80 yok
47.2 Junction Fla. 19 & 47 30 81 397
48 Fla. 47a kg 227 80.4 Junction Fla. 47A & Qbb
i) do. 50 345 &0.9 Orange Springs
50 do. 51 269 81 82 391
51 do. 52 391 81.2 Creek
52 do. 53 383 82 Pla. 47A 83 47h3e
53 do. 5k 396 2.3 Turned right onto sand road
5k do. 55 391 83 8h hex
55 do. 56 4717
503 - 36 -


R.I. 3810

Florida magnetic traverse K (Cont'd. )

—

Vertical Vertical

Station magnetic Station magnetic
Mines Road number intensity || Miles Road number intensity
oh Fla. 239 86 615 112 Fla. 61 ik THO
8&5 do, 87 578 |] 113 do. 115 750
85,4 Side road east: 114 do. 116 749
86 Fla. 239 88 601 114.6 R.R. crossing
86,4 Side road east 114.7 River
87 Fla, 239 89 621 115 117 73
&8 do, 90 600 115.5 Junction U.S. 19; R.R. crossing;
89 do, gl 632 Dunnellon, Fla.
90 do. 92 688 116 Fla. 81 118 TAL
gL do, 95 758 | 117 do. 119 762
91.5 Turned west 118 Fla. 81 120 46777
92) Fla, 239 oh 46817. || 119 do. 121 115
93 ila 827 119.8 Junction Fla. 16A'& leave
93.5 Curved north Fla. 81
oh 96 897 120 Fla. 16a 122 784
95 oT 966 121 do. 123 7167
95,3 Turned west; dirt road 122 do. 12h 766
96 98 47025 123 do. 125 762
97 99 016 1ah do. 126 752
98 100 46977 || 125 do. 127 723
98.1 Junction Fle, 74 126 do. 128 THL
99 do, 101 931 || 127 do. 129 70
100 do, 102 885 128 ao. 130 TAL
101 do. 103 831 || 129 do. 131 135
102 do. 104 738 || 130 do. 132 716
103 do, 105 THT 130 Fla. Power Co. plant
104 do, 106 704 130.7 Inglis
104,3 Junction Fla. 81 131 Pla. 164 133 710
105 “Fla. 81 107 688 |] 132 do. 134 709
106 do. 108 690 133 do. 135 691
107 do, 109 690 135 Yankeetown
108 do. 110 706 133,7 136 708
109 do. 111 716 || 133.7 End of line K
110 do. 112 714
111 do. 113 Tak .

503 - 3h


R.I. 3819

Florida magnetic traverse M (Cont'd.)

a Vertical Vertical
Station magnetic Station magnetic
Miles Road number intensity ‘Miles Road number intensity
112 Fle. 14 108 isis} 132 U.S. 19 127 936
113 do. 109 880 || 133 do. 128 955
114 do. 110 858, 134 do. 129 980
115 do. 111 859 135 do. 130 4.7023
116 do. 112 852 136 do. 131 068
116.3 Junction U.S. 19 137 do. 132 47094
116.5 R.R. crossing 138 do. 133 163
117 Suwannee River, fill and 139 do. 13h 265
guard rail 1ho do. 135 317
118 —sou.s. 19 113 845 14 do. 136 ahh
119 do. 1214 831
rhe do. 137 Bh5,
120 do. 115 836 142.5 Turned left to Fla. 295
120.4 Junction Fla. 50; Oldtown 143, Fla. 295 138 333
1eL U.S. 19 116, Bib Uhh do. 139 313
122 do. 117 859 1h5 do. iho 293
123 do. 118 847
145.6 R.R. crossing
12h do. 119 863 146 Fla. 295 a1 270
125 do. 120 855 147 do.” hye eke
126 do. 121 861 147.5 Jenna
127 do. 1e2 871 j1k8 Fla. 295 143 238
128 do. 123 879
149 hh 262
129 do. 12h 875 149.5 145 230
130 Cross City 125 874 149.5 Steward; end of line M

130.7 Cross road
130.9 Shamrock
131 U.S. 19 126 907

Florida magnetic traverse N

Vertical : Vertical
Station magnetic Station magnetic
Miles Road number intensity ||Miles Road number intensity
0 1 mile North Econfina River 9 Fla. 66 10 159
0 Fla. 66 1 47790 10 do. 11 764
1 Econfina River 2 792 11 do. 12 754
2 Fla. 66 3 783 12 do. 13 Th5
3 do. 4 790 12.3 R.R. crossing
4 do. 5 791 12.8 Creek
5 do. 6 783 13 Hampton Springs 14 747
6 do. 7 785 14 Fla. 66 15 77h
7 do. 8 782 15 do. 16 780
8 do. 9 . 159 16 do. 17 771

503 - ho -


R.I. 3810

Floride magnetic traverse 0

Vertical Vertical
Station magnetic Station magnetic
Miles Road number __ intensity || Miles Road number __ intensity
0 63ra and Dunnellon Rd. at 29 Pla. 74 30 46729
Yankeetown; at AK 32 bench 30 do. 31 7719
mark 31 do. 32 806
te) Fla. 16A to) 46710 32 do. 33 846
1.1 West of AK 32, entrance to 33 do. 34 88h
Bonita Club
1.0 East of AK 32 2 TAL 3h do. 35 911
35 do. 36 958
2 Pla. l6A-east 3 15T 36 do. 37 993
3 Inglis 4 117 37 do. 38 47018
4 Fla. 16A 5 155 38 do. 39 033
5 do. 6 758
6 do. 7 762 39 do. ho 052
LO do. AL 067
T do. 8 766 40 At Ocala airport, 500! E. of
8 Cattle guard hangar
8.05 do. 9 TT 40.95 ko O48
9 do. 10 769 40.95 Center of field across road from
10 do. 1 717 Ocala Sheet Metal Works
11 do. 12 767 41.7 Ocala Court House
11.95 Marion-Levy Colins 43,2 Fla. 19 4a ne
12 Fla. 16A 13 782 dh do. 4 114
13 do. wy 793 45 do. 45 134
14 do. 15 787 46 do. 46 163
15 do. 16 766 | AT do. 47 167
16 do. 17 763 AT Just west of Silver Springs
16.7 W. edge of 18 730 «|| 48 48 213
Dunnellon ; 49 Fla. 19 4g all
18.2 Seaboard Airline R.R. crossing 50 do. 50 185
18.4 Fla. 81 19 743
51 do. 51 167
19 do. 20 782 52 do. 52 122
20 do. al 772 53 do. 53 076
a1 do. 22 115 5h do. 5h 021
22 do. 23 746 55 do. 55 46973
23 do. ob 745 I
56 do. 56 914
eh do. 25 Th5 ST do. 57 875
25 do. 26 72h 58 do. 58 833,
26 do. 27 720 59 do. 59 800
27 do. 28 712 60 do. 60 784
28 do. 29 698

503 - he


R.I. 3810

Floride magnetic traverse J (Cont'd.)

Vertical Vertical
Station magneti Station magnetic
Miles Road. number intensi. Road. number _ intensity
127 Fla. 75 127 963 U.S. 1 139 716
127.5 R.R. crossing Oakhill ho 604
127.6 Junction Fla. 75 & U.S. 1& U.S. 1 a1 499
New Smyrna Beach Turned off U.S. 1
128 U.S. 1 128 022 U.S. 1 lhe her
129 do. 129 151 143 13 46371
130.2 do. 130 202 wh way 329
131 do. 132 281 1s 145 279
132 do. 132 2h3 uy 146 abi
133 do. 133 219 146.2 Shiloh
34 do. 134 138 147 147 236
135 do. 135 050 «||: 148 148 223
136 do. 136 46986 1h9 149 206
137 do. 137 888 || 150 150 198
138 do. 138 Belt 151 151 188
151 Allenhurst; end of traverse J
Florida magnetic traverse K
Vertical | Vertical
tation magnetic Station magnetic
Miles Road number intensity |! Miles Road number intensity
[) Coronardo, Fla., on the beach 11 Fla. 75 12 153
to) 1 Lob 11.4 Junction Fla. 57 & 75
0.5 to 0.7 bridge 12 Fle. 75 13 161
1 2 031 15 do. an 156
2 3 023 ab do. 15 138
2.3 Junction U.S. 1; New Smyrna 15 do. 16 132
Beach 16 do. 17 129
2.5 R.R. crossing 17 do. 18 118
3 Fla. 75 4 4.6955 18 do. 19 194
4 do. 5 987 19 do. 20 338
5 do. 6 968
20 do. al 47h26
6 do. 7 961 al do. 22 332
7 do. 8 008 21.5 do. 22a 157
8 do. 9 og 22 do. 23 LEQ
9 do. 10 075 22.5 do. ak 861
10 do. 1 099
503 - 32 -




R.I. 3810

Florida magnetic traverse G (Cont'd.)

Vertical
Station mag; Station magnetic
Miles nvuber i ‘| Miles Road number intensity
32 = 33 1 "G3.6 Pilled ground; Fla, 30 & 79
33 dou Bu jj 64 Fle. 30 6h, 061
33.2 RR. crossing I 65 do. 65 073
Bu 35 {| 66 dc. 66 076
3h Stations 35 & 36 marked by 67 do. 67 119
stakes |
68 do. 68 147
35 Fla, 30 36 890 69 Go. 69 180
36 do. 37 882 70 do. 70 199
36.3 Junction Fla. 29 72 do. 7 231
37 Fla, 30 38 855 72 do. 72 228
38 do. 39 833
72.5 Low hills running north and
39 do. 40 788 i south
4o do. WL 768 v6) 15 269
4d do. 4e 754 74 Fla. 30 Th 278
ye do. 43 753 ro) do. 5 291
43 do. yd, 767 75.2 Turn right; junction
yy dos “5 208 76 Circling lake 76 315
45 do. 46 oh 77 77 338
L6 do. LT 881. 78 78 353
47 do. 48 90k, 78.7 Turned left
48 do. 4g 900 79 79 390
ho do. 50 ekg 79.5 Turned right, R.R. crossing
50 do. 51 737 79.7 Frostproof
51 do. 52 719 79.9 Turned left
52 do. 53 528 80 So yay
53 Go. 5h 476 81 Fla. 350 81 ya
5h dow 55 379 82 do. 82 482
55 do. 56 263 83 do. 8&3 505
56 Middle Kissimmee River 8h R.R. crossing
56.6 Fla. 30 57 189 84,1 Fla. 30 8h 572
58 doe 58 122 85 do. 85 621
59 do. 59 45058 86 do. 86 45684
60 do. 60 028 8&7 do. 87 766
61 do. 61 022 &8 do. 88 828
62 do. 62 050 89 dos 89 831
63 do. 63 056 90 do. 90 799
503 - 22 -


os

40 $0 60 70 80 90 100

aaa

8230"

SCALE IN MILES

ez" er30°
:

ar 80°30"
re ST

FIGURE I- MAP OF FLORIDA PENINSULA SHOWING LOCATION OF MAGNETOMETER

TRAVERSES.


Florida magnetic traverse D (Cont'd.)

R.I. 3810 ©

Vertical

Vertical

. Station magnetic Station magnetic.
Miles Road. number _ intensity || Miles Road number intensity
126 Fla. 194 127 TAT 155 Fla. 29 156 L52
127 Filled ground 128 17 156 do. 157 480
128 do. > leg 682 157 do. 158 kg3
129 do. 130 647 158 do. 159 506
130 do. 131 618 |) 159 do. 160 517
131 Solid ground. 132 160 do. 161 5e1
132 Filled ground 133 161 do. 162 536
153 Solid ground 134 162 do. 163 531
13h do. 135 163 do. 164 5he
135 do. 136 H 16h do. 165 536
136 do. 137 | 165 do. 166 5he
137 do. 138 166 do. 167 552
138 do. 159 167 do. 168 5us8
139 do. 140 168 do. 169 552
140 Filled ground 141. 169 do. 170 559
wy do. he Abs, 170 do. 171 565
141.7 Junction of 194 g%. 109 \|170.3 Side road enters highway from SW.
he Fla. 109 143, 47l. ATL Fla. 29 172 578
142.4 RR. crossing. 72 do. 173 600
143, Fla. 109 Uhh 487 17. do. 174 618
Uy do. 1h5 470 17h do. 175° 640
145. do. 146 501 175 do. 176 669
146 do. 147 485 176 do. 177 692
147 do. 148 4.90 176.9 Junction Fla. 29 & old Fla. 1,
148 do. 149 hoG | now Fla. 176, & R.R.
149 Fle. 109 150 BUNT 117 Fla. 29 178 4Y6QL
150 do. 151 476 [1177.8 Junction Fla. 140, 176, 29 &
151 do. 152 457 U.S. 1
152 do. 153 46h 1178 Jupiter 179 703
152.5 R.R. crossing 178.6 180 706

178.6 On beach east of Jupiter

152.8 Junction Fla. 109 & 85 .
153 15h 477
153.4 Junction Fla. 109 & 29
154 Fla. 29 155, Ako '
503 -15-


4 “
1O7F ee =
Tallahassee

TRAVERSE P

<
Wgtborn Xe. Lake

Htodion®

ty "Bcd concise pire

¥ ai LSS
Mace «= ¥ “rE

cy eo

a eg) laa
“ 7"
Sandersond~ st Vi
60 ,-* Ql
peer ae ‘90 is! Nl M \

Ve

Macclenny

3 Lag”
* a oe ais
"4 ble Ellisville — Providence

— ee es 236 = .
FiWhite © Mikesville

f
A
PHOSPHATE. MINE

7

iter

Starke > -

rid 8

130 Waller

je Kings ley {;cPemey

Urangedale

pf * 160

1S8

Putnam,
Hall

59 Flora
& oN Home 40
eee, Maraiay Se

& Wood burt.

a
FLA. 261

FLAME

arms

FIGURE &- TRAVERSE CHARTS OF M,N,AND P


R.I. 3810

Florida magnetic traverse A (Cont'd. )

Vertical Vertical
Station magnetic Station magnetic
Miles Road number intensity || Miles Road number intensity
Sh TA 5 637 95.2 Little Torch 77A 665
55 On bridge Key
56 do. 96.7 ka 78a 649
57 do. 96.7 Ramrod Key
57.6 55 608 97.7 On bridge
; 98.7 da TOA 635
58 Fill and bridge
59 do. 99.7 dp 80a 632
60 do. 99.7 Summerland Key
60.5 56 571 101.2 ha 81a 623
61.4 57 573 102.7 do. 82a 611
104.2 do. 83a 604
62.5 58 42566 |
64 59 565 ||105.7 do. Sha 42586
65 ka 60 5 107.2 do. 85a 582
66 do. 61 587 108.7 do. 868 558
67 do. 62 590 110.2 do. 87a 581
111.7 do. 88a 569
67 Bone Fish Key
68.5 ka 63 609 113.2 do. 89a 566
70 do. 64 612 114.7 do. 90A 564
71.5 do. 65 628 116.2 do. 91A 565
72.8 Marathon Store 117.7 do. 92h 562
118.7 do. 93k SHS
73 ha 66 665
73.7 to 80.7 Bridge 119.7 do. Oba 554
75.8 Pigeon Key 120.7 do. 954 542
81 da 67 692 121.7 do. 968 479
82 do. 68 682 121.7 West end of bridge
. 122.7 kp 97A 546
83.5 do. 69 678
84.5 do. 70 657 123.6 do. 98a 526
86 do. val 649 125.5 do. 998, 527
86 West Summerland Key 127.7 do. 100A 487
88 La 72 639 127.7 Baseball grounds, Naval Reserva-
tion near radio station; tra-
89.5 do. 13 659 verse ended at Key West
90. do. ThA 660
92.2 do. TSA 688
93.7 do. 76A 665
93.7 West end of bridge

503 -1-


a
w
z
=
9
a
of
a
°
g
°
°
9°
a
Os
+
°
i)
2.
od

FIGURE 9
FLORIDA PENINSULA MAGNETIC RELIEF MAP



R.I. 3810

Florids magnetic traverse E

Vertical | Vertical
Station mag i Station magnetic
Miles Road. mumber inter Miles Road number ___ intensity
0.0 U.S. 1 and Fle. 8 in Fort ah Fla. & 3h Sil
Pierce 35 do, 35 4h 802
0.6 In school 1 45125 35.5 R.R. crossing
grounds 35.6 Junction Pla. 8 & 85
2 Fla. 8 2 122 36 Fla. 8 36 796
3 do. 3 078
4 do. 4 O71 36 Okeechobee city limits
| 36.9 Junction Fla. 8 %& Fla. 29
4,1 Road intersection | 37 Middle of town parkway
5 Pla. & 5 O54 i] 37 37 792
6 do. 6 O46 37.4 R.R. crossing west edge
7 do. 7 054 Okeechobee
6 do. 8 * 066
j 38 Fla. 8 38 800
9 do. 9 060 || 39 do. 39 800
10 do. 10 069 ho do. ho 807
11 do. 11 068 AL do. AL &09
12 do. 12 053 he do. he 806
13 do. 13 035
\) BS do. 43 810
14 do. 1 ol7 oe do. Ab 806
15 do. 15 022 45 do. 45 791
16 do. 16 O45 46 do. 46 756
17 do. 17 057 46.6 Kissimmee River
18 do. 18 060
47 Filled ground 47 695
19 do. 19 ohL 48 do. 4S 694
20 do. 20 016 is) Fla. 8 use) 697
a1 do. el OO | 50 do. 50 van
22 do. 22 4ho78 | 51 do. 51 738
23 do. 23 967
52 Fla. 8 52 44770
ob 20. eb 932 53 do. 53 798
25 do. 25 907 53.9 Junction Fla. 8 & 145 in
26 do. 26 906 Brighton
27 do. 27 893 5k Fla. 8 5h 792
28 do. 28 874
55 do. 55 792
29 do. 29 45850 56 do. 56 802
30 do. 30 839 5ST do. 57 &25
31 do. 31 818 58 do. 58 857
32 do. 32 818 5 do. 59 899
33 do. 23 813

503

-16-




R.I. 3810

Florida magnetic traverse N (Cont'd. )

Vertical jj Vertical
Station magneti | Station magnetic
Miles Road_ number inte: ‘Miles Road number _ intensity
76 Fla. 5A 77 1105. Providence 106 303
7 do. 78 105.8 Side road south
78 do. 79 106 Fla. 56 107 282
78.6 Fort White 106 Junction Fla. 28; R.R. crossing
78.9 Dirt road (cut-off) ; 106.1 Junction Fla. 28 & 49
|
79 Fla. 236 80 47303 106.2 Lake Butler
80 do. 81 307 106.5 R.R. crossing
81 do. 82 294 107 Fla. 28 108 47327
82 do. 8&3 285 ||107.1 Junction Fla. 28 & 49
85 do. 8h 301 108 Fla. 28 109 339
8h do. 8 288 109 do. 110 371
85 do. 86 259 110 do. 111 417
85.6 Junction dirt road, U.S. 41, 110.7 New River
turned north ill Fla. 28 112 510
86 U.S. 41 87 283 ne do. 113 568
|
87 do. 88 31313 do. nh 605
88 do. 8&9 343 ame do. 115 639
89 do. 90 393 115 do. 116 641
90 do. 91 45h 116 do. 117 610
90.3 Junction U.S. 41, Pla. 56, 117 do. 118 641
turned right
’ 118 do. 1g 657
91 Fla. 56 92 433 119 do. 120 664
92 do. 93 415 120 do. 121 690
93 do. ou 369 1el do. 122 709
93.5 Providence 121.6 Junction Pla. 13; turned left
oh do. 95 346
121.7 Starke, Fla.
95 do. 96 326 122 Fla. 28 123 696
96 do. 97 305 122.1 Junction Fla. 48, turned right
97 do. 98 327 122.2 R.R. crossing
98 do. 99 340 123 Fla. 48 12h 754
59 do. 100 3h9
12h do. 125 788
100 do. 101 337 125 do. 126 805
101 do. 102 360 126 do. 127 841
102 do. 103 369 127 do. 128 852
103 do. 104 353 —«j128 do. 129 868
104 do. 105 320
503 - he -




Florida magnetic traverse D (Cont'd. )

R.I. 3810

Vertical | Vertical
Station magnetic | Station magnetic
Miles Road number _ intensity || Miles Road number __ intensity
9 Fla. 161 10 935. «|| 37 Fla. 262 38 838
9.7 R.R. & road turns 38 do. 39 822
10 11 91 39 do. ko 793
1 Fla. 181 12 916 ho do. Ad 771
1 Stations 11, 12 & 13 parallel | 41 do. he 770
to R.R.
he do. i) 7712
12 Fla. 181 13 902 4a do. yh 771
13 do. 14 896 uy do. 45, 716
14 do. 15 866 45 Intersection Fla. 2 & 262
15 do. 16 850 45 Fla. 262 46 804.
16 do. 17 788
46 do. 47 835
17 do. 18 722 a7 do. 48 844
17.9 Junction U.S. 41 & Fla, 181 47 (This road was merely a trail from
18 19 699 Bermont to Hall city, which is
19 20 696 south of Palmdale. Mileage may be
20 U.S. AL 21 707 a little off due to deep; loose
sand)
el do. 22 725
22 do. 23 728 4S Trail ho 860
23 do. ob 759 ho do. 50 870
ak do. 25 708 50 do. 51 868
25 Edge of bay 26 762 51 do. 52 876
52 do. 53 887
26 27 762
26 E. side bridge, entering Punta || 53 do. 5u 898
Gorda 5h do. 55 899
26.3 Jct. U.S. 41 & 17 55 do. 56 909
27 U.S. 17 28 776 56 do. 57 908
28 do. 29 788 57 do. 58 866
29 do. 30 44827 58 do. 59 44877
29.8 Junction U.S. 17 & Fla. 262 59 do. 60 888
30 8=Fla. 262 31 835 60 do. 61 883
31 do. 32 847 61 do. 62 881
32 do. 33 871 62 do. 63 873
33 do, 3h 887 63 do. 6h 8e9
3h do. 35 687 64 do. 65 883
34.3 R.R. crossing 65 do. 66 817
35 Fla, 262 36 868 66 do. 67 869
36 do. 37 Bh 67 do. 68 867
503 -b-


Florida magnetic traverse P (Cont'd.)

R.I. 3810

Vertical Vertical

Station magnetic Station magnetic

Miles Road number _ intensity || Miles Road. number __ intensity
173.6 Cross road 182 U.S. 90 178 861
174 U.S. 90 170 954 183 do. 179 Bul
175 do. 171 7g 184 do. 180 856
175.5 Junction Fla. 43 185 do. 181 831
176 U.S. 90 172 48030 186 do. 182 802
177 do. 173 £48000 187 do. 183 Beh
178 do. 174 47997 188 do. 164 808
179 do. 175 8he 189 do. 185 768
180 do. 176 883 190 do. 186 157

181 do. 177 878 190.6 Junction U.S. 319; Tallahassee
191 U.S. 90 187 740

503 - hg -






R.I. 3810
Florida magnetic traverse C
Vertical Vertical
Station magnetic Station magnetic
Miles Road. nuuber intensity ||Miles Road number intensity
Traverse C starts at Pine Island
Sound west of Fort Myers at west of
Fla. 183
to) Fla. 183 1 AASob 26.5 Paved road
1 do. 2 540 27 Fla. 292 28 44530
2 do. 3 513 28 do. 29 kok
3 Small bridge 4 478 29 do. 30 515
3.4 Large bridge 30 ao. 31 505
4 Fla, 183 5 539 30 Road turns sharp left
5 do. 6 513 31 =o Plla. 292 32 50h
6 do. 7 516 32 do. 33 530
7 do. 8 500 33 do. 34 533
8 do. 9 539 3h do. 35 559
9 do. 10 5el 35 do. 36 526
10 do. 11 517 35.9 Road turned SE.
ll do. 12 518 36 Pla. 292 37 591
12 do. 13 535 36.7 Road turned south
13 do. 14 538 37 In Alva, Fla. 25/38 525
14 do. 15 540 37.5 Turned left, Fla. 25
14.5 Small creek 38 Fla. 25 39 567
15 Fla. 183 16 522 5) do. ho 610
16 do. 17 484 re) do. 4D 628
16.2 Junction U.S. 41
16.7 R.R. crossing AL do. he 697
17 Fla. 183 18 477 he do. 43 TAL
18 do. 19 47: 4a do. yy 710
18.4 Road to north 43 R.R. comes in parallel to road
19 Fla. 183 20 485 a Fla. 25 AS 829
20 do. al 482 45 do. 46 898
20 Doughtrey Dairy 46 do. 47 969
20.8 Bay Shore 47 do. 48 45008
el Fla. 183 22 466 47.2 Road swings away from R.R.
22 do. 23 459 46 Pla. 25 4g ohe
23 do. ek 503 hg do. 50 063
oh do. 25 Ud 49.9 Labelle
25 do. 26 497 50 Fle. 25 51 039
25.2 Road jogs north to 26.2 51 do. 52 036
26 = Fla. 183 27 505 52 do. 53 010
503 - 10 -


EVERGLADES
/ 70 50
walgeeet oe adage weet
| Ochopee .
/ NATIONAL PARK
PROJECT
<——_____—_—__

a" RAMROD KEY
= RAR FEA LITTLE TORCH KEY
(VZyoonm n= Pirates Cove€
A908 Eon ESN

WEST SUMMERLAND KE! ——A Farias MATECUMBE

~ "PIGEON KEY -————-—_— —

Toll Gat A
ate D
STRAITS O

iTe} 5 te) 10 20
Looitiiiit 1 J

SCALE IN MILES

TRAVERSE A

FIGURE 2.-TRAVERSE CHARTS OF A AND B.




\ n \
$$ ; j \\\
ae on \ \\ \
oe ex \ Vt n
eyed. rr os, \ \
S\ Orange Lake 80 Ii | 0 : i] Vee £.San Mateo NN \ \
y | orange Springs . .,.3'% Cv We \
a reel gttso wee y.—-120 VA N\A
ati hy | | "Kenwood . eon
rikaTe a | *, Andalusia . i ya
fo % 442g°=130 {IS \ \ov
'NATIONAL. PARK i nn iA Flagier Beach”
" ale wba 28, agier Beach \,

‘\

\\

t
SOCALA 1
) --
’ 50 \ L .
: ! sitet ake Disston
TRAVERSE K mnros ah ace. f Thee, 90 NATIONAL, \" @
(ROUND YORK WELL) 4Dunnellon - A an a

- ‘vo Spring

Lakeey! or
“ea” A zs NgParberville
\ 90-7", op

“aDeleon Springs 21 0

wo

“aa, wv
Dexter Lake “AUr*
Als
wo
i

Va SS

FIGURE 7- TRAVERSE CHARTS OF KK\L, AND O.


“
a A
va x j y “Al \\ \. 140
[ ‘S 7 ve - HY, Yj \\\\\ . =~ ' ah 160
\ Murd Palmdale ake “Okeechobee \\\\i.t4:" ihe
ms pte, co ‘. K , i \\ »))) Pe rt Meo °
Englewood Yer’ "PV, «jo LA B82. SRTMOM _ SN (7) Mayac a
ae “J Ms
= = y yj 3H /180
aM \ WY Jupiter

FIGURE 3- TRAVERSE CHARTS OF C ANDD,


R.I. 3810

To the best knowledge and belief of the authors the following infor-
mation was first determined by this magnetic survey:

1.

A.

503

The lower part of the peninsula is geologically a portion of the
Antillean trend, ~

The upper portion of the peninsula is geologically a part of the
Appalachian system.

The folds of the two systems are almost at right angles to each

other.

There is a zone of considerable ‘structural disturbance across the
narrow part ofthe peninsula which may be to some degree reflected
in the Gulf of Mexico coast line.

Lake Okeechobee may not be a purely surficial condition, since it
is coincident with a strong magnetic low in the crystalline base-
ment.

The magnetic-values decrease both to the west and the south through-
out the peninsula by an amount in excess of that due to the change
in magnetic latitude, which indicates that the crystalline basement
as a whole is plunging to the southwest in this area.

CONCLUSIONS

Magnetic surveys over large areas have a definite usefulness in
providing a knowledge of the geology and the structural and
topographic features of the crystalline basement, as well as of
overlying structures which reflect them. Such surveys give in-
formation concerning orogeny and general features of continental
structure, as well as of zones of weakness, shear zones, faults,
igneous bodies, and other features of smaller size in the area
surveyed.

They are economically important, especially in undeveloped regions
and areas, since they form a basis for mineral exploration and the
search for petroleum and other natural resources.

Magnetic surveys’can be accurately made at a lower cost and can

cover large areas more quickly than any other type of geophysical
survey.

Because of its speed, its economy, and the amount of information
which it yields, a magnetic survey is the logical start in
undertaking geological surveys of large areas, especially in
regions devoid of outcrops.

25


R. I, 3810

UNITED STATES
DEPARTMENT OF THE INTERIOR
Harovp L. Ickes, Secretary

BUREAU OF MINES
R. R. Savers, Director

REPORT OF INVESTIGATIONS

MAGNETIC SURVEY OF THE FLORIDA PENINSULA

BY

F. W. Lee, J. H. SWARTZ, AND S. J. HEMBERGER

May 1945


R.I. 3810

Florida magnetic traverse I (Cont'd.)

Vertical | Vertical
Station magnetic Station magnetic
Miles Road number _ intensity || Miles Road number _ intensity
65.4 B.R. crossing 83.2 Crossed R.R. and back on main
66 64 4h road
67 65 517 &h 8h 221
68 66 460 8&5 85 ahs
68 Church yard, Winter Garden, 86 86 289
Fla.
87 87 322
68.3 R.R. crossing 87.6 Jct. Fla. 2
69 67 4.6493 88 Groveland 8&8 302
69.8 Junction Fla. 208 89 Fla. 22 89 nn
70 68 YAS 90 do. 90 Psy
70.9 R.R. crossing
90 Fla. 2 turns north
71 Oakland 69 477 90.4 Mascotte
72 70 39h 90.6 R.R. crossing
72.7 R.R. crossing gL Fla. 22 91 46213
3 7 4.00 92 do. 92 199
7 72 58h
93 do. 93 202
D 73 46388 oh do. oh 237
75.1 Side road south 94.8 Junction Fla. 51
75.4 Side road north 95 Fla. 51 95 303
76 mh 387 95.9 R.R.; Mabel
77 15 335
96 Fla. 51 96 320
78 76 310 96.6 R.R. crossing
79 17 305 oT Fla. 51 97 298
79.1 R.R. crossing 98 do. 98 296
79.8 Junction Fla. 55 95 do. 99 506
80 Minneola 78 seh
100 do. 100 283
80.9 Side road to SW. 100 Crossed to north side R.R.; Linden
81 19 307 |) 101 101 336
81.6 R.R. crossing 101.4 Road junction
82 Clermont 80 287 102 102 395
Main road Clermont to Grove- 103 104 458
land closed. Returned to 104 104 4.89
79.8 miles and followed de- 105 105 420
tour around north side of 105.2 R-R. crossing
lake. 106 106 eh,
79.8 Beginning of detour 107 107 091
80 Detour 80a 366 = |/108 108 018
81 do. 81a 366 {108.2 Road junction; Richloam
82 do. 82a 298 109 109 45991
83 do. 83 237 1110 110 951
503 - 2 -





T

AS
\s 2.

RAVERSE F «

60
eA

ota Grid

.)

USAT

waa g11d¥.

MYAKKA RIV!

STATE PARK

o
attlesnake °
Headquarters

Lake
Stearns

Lake

we. . Flaue_, Childs

FLAIE
\

we PL 10 “wl

7o Brighton

67 4

Fla.

“n
I RY
ce ¥

ad

FIGURE 4,- TRAVERSE CHARTS OF E AND F.



Florida magnetic traverse N (Cont'd. )

R.I. 3810

Vertical

Vertical

Station magnetic Station magnetic
Miles Road number intensity ||Miles Road number __ intensity
17 Fla. 66 1s 770 TG Fla. 5A a7 S91
17.9 Junction U.S. 19 47 do. 48 847
18 Fla. 66 19 738 47 Mayo
18.2 R.R. crossing 48 Fla. 5A ire) 84s
18.4 Junction Fla. 5A, Perry i) do. 50 788
19 Fla. 5A 20 765 50 do, 51 773
20 do. el 781 51 do. 52 135
a1 do. 22 175 51.8 Cross road
22 do. 23 712 5@ Fla. 5A 53 745
22.3 R.R. crossing 53 do. 5h 722
22.8 Side road south 5h do. 55 47689
23 Fla. 5A ek 758 55 do. 56 681
23.7 Side road south 56 do. 57 636
ah Fla. 5A 25 173 57 do. 58 641
25 do. 26 799 58 do. 59 DOT
25.5 R.R. crossing 59 do. 60 580
26 Fla. 5A 27 4.7815 60 do. 61 541
26.9 R.R. crossing 61 do. 62 526
27 Fla. 5A 28 816 62 do. 63 522
27.6 River 63 do. 64. 514
28 eg 823 64 do. 65 534
29 Fla. 5A 30 828 64.7 Suwannee River :
30 do. 31 830 64.8 R.R.; junction Fla. 50
31 do. 32 > 831 64.9 Branford
32 do. 33 841 é5 Fla. 5A 66 556
33 do. 34 856 66 do. 67 567
3h do. 35 869+ “67 do. 68 568
35 do. 36 892 68 do. 69 572
36 do. a7 - O17 69 do. 70 590
37 do. 38 923 69 Junction Fla. 77
38 do. 39 919 70 Fla. 5A 71 578
39 do. ho “929 70 Phosphate mine
ho do. Ay 900 71 Fla. 5A 72 572
4D do, he gee 72 do. 13 564
he do. 43 923 73 do. 7 -5A7
42,1 Side road north 73.6 River
4s Fla. 5A yy 92h 73.9 High-tension line
yh do, 45 889 Th Fla. oA 15 519
45 do. 46 915 75 do. 76 481
45,6 R.R. crossing 75.7 and 75.8 R.R. crossing ("Y")

503



R.I. 3810

Florida magnetic traverse H

Vertical | Vertical
Station magnetic | Station magnetic
Miles Road number _ intensity ||Miles Road number y
(a) d line Eon Fla. Highway |; 26 U.S. 92 26
Ozona, Fla., beach 26.3 Fla. 156 crosses U.S
(0) £28 1 45640 27 UNS. 92 27
0.5 ossing 28 do. 28
L dunetion n Ve $.19 2 636 | 29 do. 29
2 3 630 | 30 do. 30
2.9 Crossroad 31 do. 31
5 4 604. 32 do. 2
4 5 597 33 do. 33
5 6 575 ah do. 3h
6 577 35 do. 35
7 Junction Fle, 17 8 593 | 36 do. 36
8 Fle. 17 623 |} 37 do. 37
8.1 RR. crossing I} 38 do. 33
9 Fle. 17 10 675 39 ao. 9
10 ao. n TkT | 0 do. Wo 28h
1 do. 12 793 if Mh do. uh 854
12 do. 13 bkh | 41.9 City limit, Plant City
13 304 14 893 he 42 786
14 do. 15 933 42,8 Junction Fla, 23
14.1 Turned left on Fle. 17 43 R.R. crossing
15 Fle. 17 16 98e nn 43 136
16 do. iT 14,6038 45.2 4d 746
17 do. 18 055 6 45 762
18 do. 19 061 47 U.S. 92 46 740
19 do. 20° 05% 48 do. 47 737
20 do. al 08 49 do. 48 720
20.1 Crees road | 50 do. kg 72
21 22 026 «| O51 do. 50 699
21.7 Intersection U.S. 541, 41, 52 do. 51 ql
and 92, Tompa, going east on 52.7 R.R. underpass & city limit of
U.S. 92, Tampa Lakeland
2 23 * 003 53 52 663
23.5 RR. crossing 5h Center Lakeland.
2h «EY edge Tampa 2h y5gek 54.4 RR. crossing -
25 Us. 92 25 905 55 U.S. 92 53 669
25.5 RR. crossing 55.1 R.R. underpass

503


R.I. 4810

Florida magnetic traverse C (Cont'd.

Vertical Vertical
Station magnetic Station magnetic
Miles Road. number intensity ||Miles Road. number intensity
y Fla. 19h qk Uh782 29 Fla. 25 139 762
5 do. 115 776 30 do. 140 764
6 do. 116 167 31 do. 141 829
7 do. 117 760 31,2 Intersection Route 199, Fla. 25
8 do. 118 751 32 he felts}
9 do. 119 739 33 do. 143, 857
10 do. 120 724 3h do. wh 886
1 do. 121 711 35 do. 145 88h
12 do. 122 692 36 do. 146 896
13 do. 123 684 37 do. 147 872
1 do. 12h 687 | 38 Fla. 25 148 44860
15 do. 125 Tuk |} 39 do. 149 853
16 do. 126 693 ho do. 150 82k
17 do. 127 700 40.8 Sharp left turn
18 do. 128 710 a 151 821
19 do. 129 711 ha 152 813
19.3 Route Fla. 194 intersection | 43 153 821
with Fle. 25 43.5 R.R. crossing
20 Fla. 25 130 713 yy 154 7195
el do. 131 696 k,2 oR. R. crossing
22 do. 132 712
23 do. 133 716 45 155 728
ob do. 134 Te 45 Edge of first water
45.7 156 712
25 do. 135 72h
26 do. 156 734
26.6 Canal at Loxahatchee
27 Fla. 25 137 734
28 do. 138 Tak
Florida magnetic traverse D
Vertical | Vertical
Station magnetic Station magnetic
Miles Road number intensity ||Miles Road number intensity
Traverse D started at Englewood
fo) 1 YL87E, 4 Fla. 181 5 967
1 2 891 5 do. 6 974
2 3 930 6 do. 7 OTT
2.3 Junction 173 & 181 7 do. 8 974
3 Fla. 181 4 911 8 do. 9 956

503



R.I. 3810

Florida magnetic traverse I (Cont'd. )

Vertical Vertical
Station magnetic Station magnetic
Miles Road number intensity || Miles Road number intensity
110.9 Junction Fla. 23 South de Brooksville
111 111 89h 128.3 B.R. crossing
111.2 R.R. crossing 129 U.S. 19 129 280
111.8 Junction Fla. 23 (main 130 do. 130 298
highway) 131 do. 131 292
112 Fla. 51 112 4.5896
132 do. 132 288
113 . do. 113 45889 133 do. 153 267
114 do. “1h 892 13h do. 134 255
114.8 Big Creek 135 do. 135 267
115 115 921 136 do. 136 277
115.3 R.R. & cross road 137 do. 137 289
116 Fla. 51 116 936 | 338 do. 138 304
117 do. 117 915 |, 139 do. 139 311
118 do. 118 936 140 do. 140 320
119 do. 119 93h 140.8 Road junction, Fla. 15 turned
120 do. 120 92 northward to Bayport
120.8 Junction Fla. 51 & 34 aya arom 46318
121 , . 121 936 142 lhe 311
122 ‘122 970 143, 143 312
123 123 46020 |) 14 Way 332
12h lek 075 145 145 328
125 125 116}, 146 146 327
125.9 R.R. crossing i 146.3 Junction to Pine Island
126 , 126 145 147 147 305
127 127 193 17 Bayport, Fle.; end line I
128 128 226
Florida _megnetic traverse J
Vertical || Vertical
Station magnetic Station magnetic
Miles Road number intensity || Miles Road number intensity
0 Homosassa Beach 6 Fla. 268 7 319
(o) 1 46361 7 do. 8 357
0.6 R.R. crossing 1 8 do. 9 362
1 2 359 || 8.7 Tampa high-tension line
2 3 380 9 Fla. 268 10 375
3 4 375 10 do. me 394
3.7 Junction Fla. 15 10.6 Janction Pla. 22
4 5 365 ll Fla, 22 12 392
4,2 Homosassa Springs 11.1 Lecanto, cross road
5 Fla. 268 377 «| 12 Fla. 22 13 428
503 - 29 -


Florida magnetic traverse C (Cont'd. )

R.I. 3810

Vertical Vertical
Station magnetic Station magnetic
Miles Road. number ____ intensity |! Miles Road number _ intensity
53 Fla. 25 5h 450eh 85 Fla. 25 86 y-902
5k do. 55 O34 86 do. 87 881
55 do. 56 ol 87 do. 88 831
56 do. 57 4h900 &8 do. 89 840
57 do. 58 984 89 do. 90 838
58 do. 59 965 89 Filled-in ground .
59 do. 60 93h 90 Fla. 25 91 850
60 do. 61 3h 91 do. 92 805
61 do. 62 926 92 do. 93. 839
62 do. 63 922 93 do. ok 812
63 do. 64 963 ok do. 95 823
64 do. 65 99k 95 do. 96. 851
65 do. 66 4.5028 96 do. oT 784.
66 do. 67 038 97 do. 98 . 693
67 do. 68 033 97.4 R.R. tracks, South Bay
68 do. 69 020 98 Fla. 25 +99 719
69 do. 70 oe 99 do. 100 717
70 do. 72 45015 {1100 do. 101 719
7 do. 72 027 «|1100.4 Road turns north
72 do. 3B o1e 101 102 770
16) do. Th 072 1o0e 103 711
Th do. 75 018 102 Highway 143 joins from north
10) do. 76 001 103 Fla. 25 lok Th8,
76 do. 71 4uogT 104 do. 105 733
17 do. 78 979 105 do. 106 778
78 do. 719 982 106 do. 107 - 763
719 do. 80 97k 107 do. 108 113
80 do. 81 945 108 do. 109 765
81 do. 8e O45, 108 Road closed; returned to Canal
81 Entering Clewiston Point
82 & 925 (o) At Canal Point, new starting
8e Leaving Clewiston point
82.5 R.R. tracks ° Fla. 194 110 THS
83 Fla. 25 8h. g1e 1 do. 111 782
8h do. 85 - 901 2 do. 112 155
3 do. 113 119
503 -n-


R.I. 3810

Florida magnetic traverse P (Cont'd. )

Vertical Vertical

Station magnetic Station magnetic
Miles Road number _ intensity |} Miles Road number _ intensity
ll7oU.S. 90 113 jeg |) 146 U.S. 90 The 768
117.3 Suwannee River 147 do. 1435, 795
118 U.S. 90 114 107 147.1 Junction Fla. 35
119 do. 115 099 148 U.S. 90 14h 772
119.6 R.R. overpass 148 R.R. crossing; Greenville
120 U.S. 90 116 089 148.1 Junction Fla. 35
121 do. 117 106 kg U.S. 90 145 761
122 do. 118 065 150 do. 146 717
123 do. 119 039s} 152 do. 147 780
12h do. 120 015 |} 152 do. 148 196
125 do. 1e1 47985 153 do. kg 808
125.7 Cross road; Lee 154 do. 150 811
126 «U.S. 90 122 945 || 154.3 aucillea River
127 do. 123 gll |} 155 U.S. 90 151 838
128 do. 124 898 156 do. 152 852
129 do. 125 849 «| 156.2 Junction Fla. 42
130 do. 126 827 1157 —s-U.S. 90 153 862
131 do. 127 830 158 do. 154 884
132 do. 128 82h |; 159 do. 155 925
133 do. 129 792 | 160 do. 156 956
133.5 R.R. crossing 161 do. 157 977
133.8 Cross road 162 do. 158 48025
134 U.S. 90 130 723 | 163 do. 159 017
134 Junction Fla. 9, Madison 163.7 R.R. crossing
135 131 753 164 U.S. 90 ° 160 47974
136 U.S. 90 132 47753 165 do. 161 4.8026
137 do. 133 7711 166 do. 162 016
138 do. 134 772 166.1 R.R. underpass
139 do. 135 786 167 U.S. 90 163 001
140 do. 136 769 168 do. 164 4.7987
141 do. 137 740 169 do. 165 984
142 do. 138 750 170 do. 166 985
143, do. 139 774 171 do. 167 962
yh do. 140 159 172 do. 168 974
wb5 do. 141 ThS 173 do. 169 947

503 - 48 -






R.I. 3810

Florida magnetic traverse M (Cont'd.)

=

Vertical Vertical
Station magnetic Station magnetic
Miles Road number _ intensity |i Miles Road number _ intensity
58.1 Cross road 183 Fla. 14 79 3h9
58.4 Melrose fils do. 80 334
59 Fla. 267 56 583 85 do. 81 320
60 do. 57 575 | 86 do. 82 298
61 do. 58 570 87 do. 83 265
62 do. 59 571 88 do. 8h 259
62.2 Cross road 89 do. 85 235
63 Fla. 267 60 574 90 do. 86 197
6h do. 61 557 gl do. 87 170
64.2 R.R. junction Fla, 31 92 do. 88 . 153
65 Fla. 267 62 551 93 do. 89 125
66 do. 63 531 ou do. 90 089
67 do. ob 527 gh.2 Cross road
68 do. 65 508 95 Fla. 14 91 090
69 do. 66 502 $5.2 Junction U.S. 41
70 do. 67 493 95.3 Newberry
7 do. 68 480 |! 95.5 R.R. crossing
12 do. 69 455 96s Fla. 14 92 080
B do. 70 4ST |) 97 do. 93 o74
73.3 Side road south 98 do. oh 062
7 Fla. 267 71 45k log do. 95 029
15 do. 72 455 99.7 High-tension line
76 do. 73 419 100 Fla. 14 96 006
76.1 Junction Fla. 14 101 do. 97 46993
76.3 R.R. junction Fla. 13 102 do. 98 995
77 Within city limits 103 do. 99 47003
77.3. Gainesville, Fla. 104 do. 100 4.6993
77.5 R.R. crossing 105 do. 101 989
78 Fla. 267 TH 4738 |] 106 do. 102 47017
wis) Junction with U.S. 441 107 do. 103 028
Univ. of Fla. campus
108 do. 104 009
19 Fla. 1 5 406 108.4 Junction Fla. 77, Trenton
80 do. 76 406 109 Fla. 14 105 4.6989
81 do. TT 377 110 do. 106 gho
81.3 Side road north 111 do. 107 911
82 78 320
503 - 39 -



R.I. 3810

Florida magnetic traverse P

Vertical Vertical
Station magnetic Station magnetic
Miles Road. number _ intensity || Miles Road number intensity
0 Fle. 78 1 L574 22.7 Cross road
to) At Atlantic Beach, reinforced 23 U.S. 90 20 4777.
concrete wall along beach ak do. a1 TTD
1 2 713 25 do. 22 785
1.5 Side road north 26 do. 23 787
2 Fle. 78 3 716
| 27 do. ob 785
2.7 Draw bridge 28 do. 25 774
3 Fla. 73 4 706 29 do. 26 726
A do. 5 712 30 do. 27 749
5 do. 6 710 31 do. 28 148
6 do. 7 699 ||
32 do. 29 791
7 do. 8 712 33 do. 30 873
8 do. 9 719 3h do. 31 895
8.1 Side roaa north 35 do. 32 893
9 Fla. 78 10 716 36 do. 33 853
10 do. 1 719
37 do. 34 783
il do. 1e 783, 37.7 R.R. crossing; Baldwin
12 do. 13 754 37.8 Junction Fla. 13
12.7 Bridge 38 U.S. 90 35 680
12.9 Cross road 39 do. 36 639
13 Fle. 78 14 TAT
40 do. 37 630
13.6 Bridge at do. 38 605
14 Fle. 78 15 Tuo =|) 41.6 R.R. overpass
15 do. 16 153 42 «U.S. 90 39 597
15.2 Side road south 43 do. ho 587
16 Fla. 78 17 723
Ay do. ai 601
16 Junction U.S. 1; right turn 45 do. ho 601
16.8 Left turn 6 do. 43 609
17 18 754 47 do. Ab 581
17 South Jacksonville | 47 Macclenny
17.3 +S. bank St. Johns River |
| 4g U.S. 90 us 631
17.9 N. bank St. Johns River; 48.3 River
junction U.S. 17 pe) U.S. 90 46 631
18.3 Junction U.S. 90, left turn; 49.3 Side road north
heart of Jacksonville, Fla. 50 U.S. 90 47 638
21.7 U.S. 90 19 734
503 - 46 -


R.I. 3810

Florida magnetic traverse F (Cont'd. )

Vertical fl Vertical
Station magnetic | Station magnetic
Miles Road nunber intensity | Miles Road number “intensity
22 Fla. 1&4 22 gie | 56 Fla. 63 56 45203
23 do. 23 893 57 do. 57 2h7
oh do. ah 881 || 58 do. 58 269
25 do. 25 88h || 59 do. 59 298
26 do. 26 899 | 60 do. 60 322
i] 61 do. 61 333
27 do. eT 44888 |
28 do. 28 881 |) G2 do. 62 554
29 do. 29 865 | 63 do. 63 338
30 do. 40 860 i 63.8 Ona, Fla.; R.R, crossing
31 do. 31 854 on, 64 376
65. Fla. 63 65. 382
32 do. 32 864 .
32.2 Junction Fla.161 % 18a; paved 66 do. 66 367
road |:66.8 Junction Fla. 302 & begin
33 ‘la. 18a 33 879 sand road .
3h do. Bu 886 67 Fla. 65 67 345
34.7 Verna; junction Fla. 180 68 do. 68 328
35 Fla. 18a 35 gel €9 do. 69 302
36 do. 36 4hg1g 70 do. 7o 290
37 do. 37 875 71 Pavement begins 71 267
38 - do. 38 - 827 71.6 Junction U.S. 17.
39 do. 39. 715 71.9 Zolfo Springs .
ho do. 4o TAT 7 72 232
AL do. AL 729 72.2 Turned left off U.S. 17
41.9 Myakka City; Junction Fla. 72.3 R.R. crossing

he

Ay

45
46

Ay
48
49
50

51
5e
53

5D
503

18a % Fla. 63; turned north
toward Wauchula

Fla. 63 he Tho
do. 4a 760
do. Wy 788
do. AS 820
do. 46 839
do. 47 873
do. 48 896
do. hg 915

Road turns to east

Fla. 63 50 oh6
do. 51 981
do. 52 45015
do. 53 o72
do. 5h 110
do. 55 152

72.6

16)
7h
715
716
17
77.6
78
19

80
81

82
83

8h
85

- 19 -

Worn-out pavement leading to
Fla. 32 begins .

Fla. 32 13 228
do. TH 217
do. D 220
do. 76 220
do. vad 2ho

Junction Fla. 32

Fla. 32 78 45266
do.” 19 275
do. 80 250
do. 81 259
do. 82 45257
do. 83 256

Big Charlie Creek

Fla. 32 84 261
do. 85 286


R.I. 3810

Florida magnetic traverse F (Cont'd.)

Vertical Vertical
tation magnetic Station magnetic
Miles Road mmber _ intensity || Miles Road number intensity
86 Fle. 32 86 289 112 Tz 056
8&7 do, 8&7 29 112.9 Small creek
88 do. 8&8 296 113 113 oho
89 do. 89 263 (|| 124 nh 4go8
90 do. 90 ahs, 115 115 45005
| =
91 do. 91 231 |) 116 116 015
92 do. 92 201 || 117 ly 020
92.1 Junction Fla. 8 & Fla. 32 1118 118 029
92.6 R.R. crossing; also at 92.7 118.3 Junction with Fle. 59
93 Avon Park; Fla. 8 93 179 119 Fla. 59 1g 037
oh 176 |; 120 do. 120 O46
95 Fla. 8 turns south | 1e1 do. 121 027
95 95 145 || 1e2 do. 122 4.999
96 Fla. 8 96 115 (|! 123 do. 123 952
97. do. o7 998 |, 125.8 Creek
98 do. 98 062 1eh Fla. 59 12h 911
98.8 R.R. crossing 12h,1 Kissimmee River Canal
99 Fla. & 99 o1e 224.5 Turn N.E. along R.R.
101 do. 100 4ko77 «1125 Fla. 59 125 855
101 do. 101 929 126 do. 126 837
102 Turned east 102 864 127 do. 127 46
102.3 R.R. crossing 127 Road swung away from R.R. tracks
102.4 Turned north I 128 Fla. 59 128 881
103 Fla. 8 103 33 i 129 ao. 129 893
103.5 Turned east onto Bassenger | 130 ao. 130 904

road

do. 131 907
104 104 ghé do. 13la gho
105 105 950 Turned left onto Long Bridge
106 106 963 across Kissimmee River
106.6 Small creek Fla. 59 13e 45062
107 107 960

do. 133 45156
108 108 Wbosh 15k 260
108.5 Large creek 135 3h
109 109 982 136 433,
110 110 45okd Took left fork of road
111 111 078

503 - 20 -


R.I. 3810

Florida magnetic traverse K' (around York well)

Vertical Vertical
Station magnetic Station magnetic
Miles Road number intensity [Miles Road number intensity
0.0 Junction U.S. 41 & 19 & Fla. 74 ib Fla. 16 1b 065
Dunnellon 14,5 Side road from south
0.9 R.R. crossing 15 Fla. 16 15 065
1 U.S. 42 e219 1 46614 16, do. 16 059
2 do. 2 653 17 do. 17 073
3 do. 686 17.6 Side road south
3.7 Side road to Rainbow Springs 18 Fla. 16 18 08h
4 U.S. 4219 4 882 19 R.R. 500! 19 083
4.5 Junction Fla. 16 south
4.7 R.R. underpass 20 R.R. 500! 20 086
south, Fla.16
5 Fla. 16 5 928 el Fla. 16 al 112
6 do. 6 gho
6.8 R.R. underpass 21.4 R.R. crossing
7 T Qs 22 Fla. 16 22 47118
8 Fla. 16 8 975 23 do. 23 141
23.2 Junction Fla. 16 & 19
9 do. 9 960 2h Fla. 16 ab 118
10 do. 10 985
11 do. 1 47023 25 Ocala 25 47103
12 do. 12 028 25.3 Junction U.S. 441
13 do. 13 ong ||
Florida magnetic traverse L
Vertical |] Vertical
Station magnetic Station magnetic
Miles Road number ___ intensity ||Miles Road number intensity
0 Cedar Keys 1 46697 13° «Fla. 13 Te B41
Beach ay do. 15 848
1 Fla. 13 2 723 15 do. 16 833
2 do. 3 133 16 do. 17 832
2.2 Bridge do. 17 do. 18 814
3 Fla. 15 4 755
18 do. 19 828
4 do. 5 Th9 19 do. 20 823
5 do. 6 787 20 do. aL 199
6 do. 7 796 a1 22 829
7 do. 8 803 21.3 Side road south
8 do. 9 811
21.7 Junction Fla. 81 & 13
9 10 816 || > Fla. 13 23 816
9.5 Junction Fla. 13 & 77 ‘22 Otter Creek; R.R. crossing
10 Fla. 13 1l 853 23 Fla. 13 ah 854
11 do. 12 837 a4 do. 25, 840
12 do. 13 829 II
503 - 35 -


R.I. 3810

Florida magnetic traverse B

Vertical Vertical
Station magnetic Station magnetic
Miles Road mumber intensity || Miles Road. number intensity
fo) Beach S. Miami 1 13720 28 U.S. ok 29 L3749
1 Sunset Drive 2 707 2g do. 30 746
2 Opp. School 3 FOL 30 do. 31 ThS
3 South Miami 4 (06 41 do. 32 5T
3.9 R.R. crossing 32 do. 33 769
4 5 712 33 do. 3h 758
5 6 707 3h do. 35 774
5.9 R.R. crossing 35 do. 36 784
6 7 711 36 do. 37 780
7 8 702 37 do. 38 794
7.5 Traverse swings N.W. on dirt | 38 do. 39 TTT
road (Snapper Creek Rd.) 29 do. ho 762
8 do. 9 706 ho do. cae 754
9 do. 10 125 4.6.3 Oasis road turns here
10 do. 1 745 | Ll U.S. ok he 153
l do. 12 743 he do. a) 748
12 do. 15 770 43 do. Ab 774
12 Heavy fill; along drainage Ay do. oe) 787
canal 4s do. 46 803
12.4 West on U.S. 94, Tamiami 46 Paolita 47 809
Trail
13 U.S. 94 14 758
14 do. 15 162 47 U.S. Ob A 8352
15 do. 16 762 Lg, do. kg 829
16 do. 17 749 ~~ | 48.6 Road turns left
17 do. 18 They hg U.S. Ok 50 814
18 do. 19 725 | 50 do. 51 791
18.5 Route Pla. 205 goes South 51 do. 52 771
19 U.S. oh 20 Ta 52 do. 53 TAL
20 do. al hh 53 do. 5k 715
al do. 22 Th 54 do. 55 689
22 do. 23 751 55 do. 56 643,
23 do. ah 753} 56 do. 57 605
2k do, 25 755 ot O57 do. 58 580
25 do. 26 136 58 do. 59 Shy
26 do. 27 TAT 59 do. 60 523
27 do. 28 TAS, 60 do. 61 504

503 -8-


R.I. 3810

Florida magnetic traverse M

~~ Vertical || Vertical
Station magnetic | Station magnetic
Miles Road number intensity|| Miles Road mumber___ intensity
0 Beach at Anastasia, Island 26 Fla. 14 25 Ba5
east of St. Augustine 27 do. 26 276
ce) 1 47639 27.8 Road intersection
0.6 Draw bridge 28 Fla. 14 27 eho
0.8 Junction Fla.lho with U.S. 1 28.2% R.R. crossing, E. Palatka
1 St. Augustine, Fla. 28.6 Junction Fla. 28, U.S. 17, &
2.8 Junction U.S. 1 & Fla. 14 Fla. 14
3 Fla. 14 2 616 29 Fla. 14 28 252
3.5 R.R. crossing 30 St. Johns River
4 Fla. 14 3 605 30.5 Palatka
31.4 R.R. crossing
5 do. 4 590
6 do. 5 564 || 52 Fla. 14 29 309
7 do. 6 521 32.3 Junction Fla. 28 & U.S. 17
8 do. 7 503, 33 Fla. 28 30 387
9 do. 8 508 3h do. 31 430
35 do. 3e 457
10 do. 9 503
10.2 R.R. crossing 36 do. 33 467
11s Fla. 14 10 500 37 do. 3h 459
11.9 Side road north 38 do. 35 450
12 Fla. 14 11 496 39 do. 26 452
ho do. 37 ASL
13 do. 12 487
1b do. 13 508 Wy do. 38 456
1 do. 1b S4uL he do. 39 476
16 do. 15 515 4s do. ho 501
16.7 R.R. crossing yy do. AL 534
45 do. 4a 575
16.9 Side road‘north
17 Fla. 14 16 528 46 do. ) 595
18 do. 17 596 47 do. kh 597
18.1 River 48 do. i) 616
19 Fla. 14 18 488 re) do. 46 62h
49.6 Cross road; Grandin
19.7 Hastings
20 Fla. 14 19 451 50 Fla. 28 47 47639
20.6 R.R. crossing - 51 do. 48 649
21 Fle. 14 20 468 52 do. kg 4b
22 do. al 455 52.7 Turned south off Fla. 28
. 53 Fla. 267 50 647
22.1 Side road north
23 Fla. 14 22 7h 5h do. 51 646
a do. 23 378 55 do. 52 632
24.2 R.R. crossing 56 do. 53 621
25 Fla. 14 ak 553 ST do. 5h 613
is) do. 55 606

503 - 38 -


R.I. 3810

Florida magnetic traverse P (Cont'd.)

j Vertical Vertical

Station magnetic Station magnetic
Miles Road number intensity || Miles Road number intensity
5lOU.S. 90 48 ELL 8h U.S. 90 Br 786
52 do.” “kg 650 85 do. 82 723
53 do. 50 646 86 do. 83 851
Sh do.” 51 640 87 do. 8h 895
5D dos 52 636 88 do. 85 918
55.8 RR. overpass 89 do. 86 939
56 «U.S. 90 53 617 90 do. 87 954
56.5- Sanderson 91 do. 88 928
57 U.S. 90 5h él1l |; 92 do. 89 923
58 do. 55 603. || 92.5 Cross road; Wellborn
59 do. 56 585 93 U.S. 90 90 900
60 do. 57 580 Oh do. 91 869
61 do. 58 585 95 do. 92 860
62 do. 59 625 |; 96 do. 93. 825
63 do. 60 698 97 do. ob 818
64 do. 61 TTT 98 do. 95 820
65 do. 62 866 98 Houston
66 do. 63 910 99 U.S. 90 96 858
66.6 Olustee 100 do. 97 875
67 U.S. 90 64 939 100.6 High-tension line
68 do. 65 939 101 U.S. 90 98 893
69 do. 66 934 |! 102 do. 99 893
70 do. 67 $29 |) 103 do. 100 892
7 do. 68 894 103. s«RLR. crossing
72 do. 69 8h2 103.7 Junction Fla. 50
13 do. 70 784 |}10h = Live oak
14 do. 71 750 105 101 gel
715 do. 72 718 105.4 R. R. crossing
76 do. 16) 702 106 U.S. 90 102 953
TT do. TH 673 107 do. 103 993
77.4 Junction Fla. 28 108 do. 104 48032
77-5 R.R. crossing 109 do. 105 064
78 U.S. 90 iB) 678 || 110 do.(Fla. 1) 106 100
79 do. 76 653 ul do. 107 112
79.5 Lake City; junction withU.S. 41/112 do. 108 122
80 U.S. 90 17 47653 113 do. 109 137
80.2 R.R. crossing ay do. 110 140
81 U.S. 90 7 659 114.1 Falmouth
82 do. 19 676 115 U.S. 90 1 156
83 do. 80 T3416 do. 112 127
503 - 47 -


R.I. 4810

ILLUSTRATIONS (Cont'd. )

Fig

Follows page

Charts of traverses G and H .......6e e

6. Charts of traverses I and J ......- 4
7. Charts of traverses K, K', L, and O. 4
8. of traverses M, N, and P.. 4
2. da Peninsula magnetic relief map . 4

INTRODUCTION

Tais investigation was,undertaken in 1939 for the purvose of securing
the necessary information relating to the field techniques and accuracy that
would be needed for magnetically surveying State-wide areas. The Florida
peninsula was chosen for such a study for two reasons: irvat, because it
is geologically ideal for such an investigation, since it comprises a series
of unconsolidated, flat-lying Tertiary and Cretaceous sediments of low mag-
netic susceptibility covering a complex and much-folded crystalline basement
comprised of rocks carrying strongly paramagnetic materials; second, because
information concerning the struciual trends of the crystalline basement would
be of great interest end.importance in the study of Appalachian orogeny and
the relationship of the Florida peninsula to both the Appalachian and Antillean
tectonic systems. The results of this magnetic survey have clearly demon-
strated that the magnetic anomalies reflect variations in the crystalline
basement. To the degree which the structures of the crystalline basement
control the structures of the overlying sediments these results are useful
for oil exploration. :

MAGNETIC OBSERVATIONS

All magnetic measurements were made with a vertical Askenia magnetic
variometer having e temperature compensated needle. All observations were
tied into two base stations located at Fort Myers end Gainesville, Fla. The
absolute vertical magnetic intensities at these two base stations were deter-
mined by the United States Co: and Geodetic Survey thin an accuracy of + 10
gammas. The accuracy of the. base station variometer used in the present survey
was of the order of + 43 gammas. The sensitivity throughout the survey of the
magnetic variometer used on the traverses approximated 50 gammas per scale
division and it is estimated that the probable error between stations along
a traverse would be about + 5 gamaias. Measurements were started on traverse
C neax Fort Myers and tied into the Fort Myers base station established by
the Coast and Geodetic Survey. Twelve traverses, comprising 1,500 station
observations, were ‘cceupied between: the Fort Myers and Gainsville base sta-
tions. When the cumulative total. of these 1,500 interim observations was tied
into the Gainesville base station it was found to differ by only 50 gammas
from the value obtained by the Coast end Geodetic Survey for that base. The
observations were adjusted for this difference.

All measurements were corrected for diurnal variations, using base~station
observations. Wherever it was necessary to make latitude adjustments a cali-
bration of the magnetometer was made by a special calibration coil, which was
attached as an integral part of the magnetometer.

503 -e-


R.I. 3810

Florida magnetic traverse I (Cont'd. )
Vertical . Vertical
Station magnetic Station. magnetic
Miles Road. number intensity || Miles Road number intensity
12.38 R.R. crossing al Fla. 22 aT 008
3  itusville he do. he 45988
13.1 R.R. crossing 4s do. 4s 46013
14 Fla. 119 14 013 Ay do. yh 023
1 do. 15 45980 44,3 Cross road
16 do. 16 953 45 Fla. 22 As 018
17 do. 17 950 46 do. 46 Ob.
18 do. 18 92). 46.8 Cross road
16.5 Junction Fle. 119 & 22 47 AT Ohk
19 Fla. 22 19 902 48 48 ole
20 do. 20 929 ho ho 035
al do. al 9T# | 50 50 030
22 do, 22 6011 50.2 Cross road
23 do. 23 [ose 51 51 065
ek do. an 190 51.5 Orlando City limit
24.8 St. Johns River 52 52 46082
25 Fla. 22 25 46275 53 Junction UiS. 17 & 92
26 do. 26 308 53.6 Turned right on Fla. 22
27 do. eT 307 53.7 R.R. crossing
28 do. 28 309 54.7 Junction U.S. 92 bypass
29 do. 29 316
29.1 Fla. 296 south 52.0 to 55.0 Orlando
29.4 do. 55 Fla. 22 53 46081
| 56 do. 5h 319
29.4 Christmas 57 do. 55 yok
30 Fla. 22 30 319 58 do. 56 410
31 do. 31 317
32 do, 32 285 59 ST 334
33 do. 33 267 || 59.8 Cross road
60 58 352
3h do. 34 ah7 61 59 179
35 a9. 35 208 61 Side road south
35.4 Bithlo
35.5 R.R. crossing 62 60 156
36 Fla. 22 36 272 63 61 221
| 65.9 Side road south
36.9 Junction Fla. 203 i) 6k 62 328
7 Fla. 22 37 12h | 65 Ocoee 63 4o1
38 do. 3 087s
39 do. 39 068
4O do. ae) 029
503 -e7 -


R.I. 3810

Florida magnetic traverse H (Cont'd. )

Vertical Vertical
Station magnetic Station magnetic
Miles Road number _ intensity || Miles Road number _ intensity
56 «U.S. 92 5k 45652 93 U.S. 92 89 811
57 do. 55 585 93.1 Detour begins; turns north
58 do. 56 550 93.5 Turned east
59.5 57 529 gh 90 808
61 58 516 95 Swamp. R.R. to north
62 59 she 95.5 91 854
63 60 567 96 Jogged to north side of R.R.
64 61 583 || 97 92 879
64.3 R.R. overpass; Auburndale 97.6 Kissimmee city limits
65 2 599 98 93 886
66 63 615 98.1 Detour ends
67 64 629 98.6 Kissimmee
68 65 637 99 U.S. 92 oh 868
68.5 Junction with U.S. 17 99.4 Junction U.S. 92 & U.S. 192
68.7 R.R. crossing 99.7 RR. crossing 94 868
69 66 656 100 U.S. 92 95 962
70 Lake Alfred 67 650 101 do. 96 994,
7 U.S. 92 68 676 | 102 do. 97 976
72 do. 69 702 || 103 do. 98 ghg
13 do. 70 712 103.8 Cross road
TH do. 7 Til |i1ck  u.s. 192 99 926
15 do. 72 675 105 do. 100 903
76 do. B 677 |] 106 do 101 go
76 dge of Haines City 106.8 R.R. crossing; side road
71 Water tower, Haines City 107 U.S. 192 102 $98
77.5 U.S. 92 7 706 108 do. 103 4.6036
19 do. vb) 71 108.5 St. Cloud
80 do. 76 722 109 U.S. 192 104 083
81 do. TT 720 110 do. 105 096
82 do, 78 157 110.9 Junction Fla. 29
85 do. 79 775 111 U.S. 192 106 45122
8h do. 80 719 112 do. 107 120
85 do. 81 783 113 do. 108 119
86 do. 82 816 114 do. 109 109
87 do. 83 810 115 do. 110 062
“88 do. 8h 45833 116 do. 111 017
89 do. 85 850 117 do. 112 985
90 do. 86 850 |} 118 do. 113 971
91 do. 87 8k7 119 do. 114 953
92 do. 8&8 820 | 120 do. 115 928
503 - 25 -




R.I. 3810

Observations along traverses were made wherever possible at l-mile inter-
vals, using the automobile speedometer for measuring the interval. No observa-
tions were made on bridges or other causeways containing steel in the reinforced
concrete. Also, all observation stations were offset some distance from the
main highway, to preclude any possibility of error due to road materials or
iron that might have been buried by road excavation work.. Wherever observa-
tions were made on fills it was so indicated on’ the traverse data sheets.

In the preparation of the traverse data and maps, observed distances have
been included as recorded on the data sheets. Additional culture taken from
automobile and Bureau of Public Roads maps, agricultural maps, and other ~
sources of information considered rolieble has been added to the treverse
maps to assist in identifying the location of the stations. Every tenth
station on such traverses has been numbered for ease in identification.
Railroad crossings and road intersections have been shown and probably con-
stitute the most permanent markers for resurvey purposes at some, later date.

The field. observations were made between February 20 and April 14, 1939,
except for traverse 0, which had been run in December 1957. Traverse C was
run first, followed by traverses A, B, D, E, F, G, H, I, J, K, L, M, N, P,
and K' in order. The distances botween the traverses varied from 20 +o 4d
miles, In all about 2,300 observations were made in an area of some 50,000
square miles. Figure 1 is an index map showing the locations and designations
of the separate traverses.

MAGNETIC TRAVERSES

Traverses A and B are shown in figure 2. Traverse A begins at the north-
ern portion of Key Largo and ends'at Key West. The mcasurements on this tra-
verse were taken'on the keys, and no stations were measured on the concrete
Structures or cement road which comprise large stretches in this interval.
Traverse B begins on the beach of South Miami and follows the Tamiami Trail
to Naples. Wherever possible the measurements were made off the trail in the
Everglades. Owing to fires which were raging at the time this work was under-
-way it was impossible to run magnetic traverses along trails in the Everglades,

Traverses C and-D are shown in figure 3. Both traverses were run from
-west to east. Traverse C was interrupted by rodd construction end was finished
by way of Canal Point to Lake Worth. Traverse D started at Englewood and
followed the northern shore to Lake Okeechobee to Jupiter.

Travérses E and F are shown in figure 4. Both traverses were regular ex-
cept the areas around Fort Drum. Due to their location on Indian reservations
the roads were more or less trails in this region. Owing to deep sands,
gulleys, etc., in this area measurement locations were reached with great
difficulty.

Traverses G and H are shown in figure 5. Both traverses were normal ex-
cept for that part of traverse H through the Tampa area, where little was
known concerning possible buried iron.

503 -3-


R.I. 3810

Florida magnetic traverse L (Cont'd. )

Vertical H Vertical
Station magnetic i Station magnetic
Miles Road number intensity |; Miles Road number intensity
8h 85 Qik | ii5 “Fla. 28 15 26h
85 &6 418 116 do. 116 264
86 Side road north 87 4k {117 do. 117 303
87 88 437 118 do. 118 330
87 Road intersection; Kenwood, 119 do. 119 277
turned left
120 do. 120 2ok
88 Pla. k7a 89 472 1e1 do. 121 189
88,1 -Turned right 122 do. 122. o72
89 90 459 123 do. 123 46929
90 Fla. 47a 91, 450 leh do. 12h 895
91 do. 92 yea |
125 do. 125 864
92 do. 93 450 | 126 do. 126 839
93 de. oh 457 Wae7 do. 127 820
on do. 95 435 |) 128 do. 128 815
95 do. 96 45k || 129 do. 129 819
96 do. 97 475
130 do. 130 818
97 do. 98 Shy 131 do. 131 837
98 do. 99 - 583 132 do. 132 82h.
99 do. 109 519 133 do. 133 839
100 do. 101 477 13h do. 134 854
101 do. 102 457
135 do. 135 864
102 do, 103 462 136 do. 136 869
102.2 Cross road; pavement 137 do. 137 835
103 104 ns) 138 do. 138 847
103.4 Cross road 138.4 R.R. overpass
1oh = Fla. 47a 105 4a5
138.8 Junction U.S. 1
104.1 Junction Fla. 14; turned right ! 139 Fla. 28 139 46810
105 Fla. 14 106 410 1139.3 Bunnell, turn left on Fla. 28
106 do. 107 399 140 Fla. 28 140 819
107 do. 108 354 aka do. wa 823
108 do, 109 329
he do. 142 830
109 110 47196} 1h3 do. 1h 838
109 Inside Palatka City limit jad do. wy 843
109.2 Junction U.S. 17 )l44.3 Side road south
110 Bridge St. Johns River hs Fla. 28 15 854
110.7 U.S. 17 ni 239
46 do. 146 875
111.4 Junction Fla. 14.4 28 & U.S.17 147 do. 147 899
112.—OUS. 17 ie 232 /147.2 Bridge to island
115 do. 113 ahs 147.7 Flagler Beach
114 do. 114 327 f1u7.8 we 880
114.6 Junction Fla. 28 & U.S. 17
147.8 Junction Fla. 140; end of line L

503 - 37 -


R.I. 3810

Florida magnetic traverse N (Cont'd.)

Vervical || Vertical
Station magnetic | Station magnetic
Miles Road number _ intensity || Miles Road number _ intensity
129°”—SOFila. 4S 130 y 62 1) 153.5 E. bank St. Johns River
130 do. 131 864 155.3 Fla. 48 155 812
131 do. 132 882 155.5 Cross road
132 do. 133 887 156 Fla. 48 156 799
133 do. 154 883 157 doy 157 782
134 do. 135 4.7867 158 do. 158 47768
135 do. 136 75 159 do. 159 755
136 do. 137 879 160 do. 160 751
136.1 Cross road 161 do. 161 723
137 Fla. 48 138 878 162 do. 162 696
138 do. 139 878 163 do. 163 - 679
139 do. 1b0 882 164 do. 164 688
140 do. Via 867 16424 Cross road
141 do. 1ke 852 (1165 = Fla. 48 165 683
141.4. Penney Farms | 166 do. 166 673
ike Fla. 48 15 857 167 do. 167 674
1435 do. hk 846 168 do. 168 670
hh do. 145 86 169 do. 169 653
1h5 do. 146 828 170 do. 170 616
146 do. 147 854. 170.3 Side road south
147 do. 147 854 171 Fla. 48 171 594
147 do. 148 By 172 do. 172 589
148 do. 1k9 807. 173 do. 173 50h
148.5 Junction U.S. 17 17h do. 174 600
149 Fla. 48 150 795 v5 do. 175 5904
i
149.2 RR. crossing |175.5 Side road north
149.6 Junction U.S. 17 & Fla. 48; 175.8 R.R. crossing
turned right; Green Cove [276 Fla. 1:5 176 574
Springs (| 276 on U.S. 1

150 Fla. 4S 151 84.2 LIT
150.3 Side road south

nit, St. Augustine

177.5 St. Auzistine 177 605
151 Fla. 48 152 841 177.9 Left turn onto bridge, Fla. 140
152 do. 153 877 i|278.8 Fla. 140 178 639
155 do. 154 823, Same location on beach as station 1
153 W. bank St. Johns River line M

153.5 St. Johns River

502 -43 -


——> =e

Vien. Gebel
ge Harta LS \\
: News.
; Smyrna‘)
Alamanae_jjo Beach

US. 17.

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FIGURE 6.- TRAVERSE CHARTS OF | AND J.


R.I. 3810,
May 1945.

REPORT OF INVESTIGATIONS

UNITED STATES DEPARTMENT OF THE INTERIOR - BUREAU OF MINES

1

@. Charts of traverses A and B weaeee
3. Charts of traverses C and D...

4, Charts of traverses E.and F...

wAcumric SURVEY OF THR FLORTDA PentysuLal/

By F. We tee,2/'3. B Swartz ,2/ and 8. J. Hemberger!/

CONTENTS

Introduction ...
Magnetic observations ..
Magnetic traverses ..... Se eeeeecees
Charting of magnetic observations ...
CONCLUSIONS ceeeccccceveeecceccnecsenecnce

TABLES OF MAGNETIC OBSERVATIONS

Traverse
Traverse
Traverse
Traverse
Traverse
Traverse
Traverse
Traverse
Traverse
Traverse
Traverse
Traverse
Traverse
Traverse
Traverse
Traverse
Traverse

HOB EPA RGHHAOSHVaAWP

ILLUSTRATIONS

Map of Florida Peninsula, showing location of magnetometer
ULAVELSES weeeeeeeee

Follows page

pnmnwn

17 The Bureav of Mines will welcome reprinting of this paper, provided the

following footnote acknowledgmnet is used:

Mines Report of Investigations 3810."
2/ Chief, Division of Geophysical Exploration, Bureau of Mines.

503

2), Senior Geophysicist, Bureau of Mines.
/ Principal geophysical draftsman, Bureau of Mines.

"Reprinted from Bureau of


R.I. 3

CO

10

Florida magnetic traverse E (Cont'd.)

Vertical |! Vertical
Station magnetic tation magnetic
Miles Road number _ intensity || Miles Road number _ intensity
Tek Fla. 230 ele 639 fi lke Pla. 220 whe Wheke
125 do. 125 622 142.4 Side road north
126 de. 126 606 143 Fle. 220 143, 6he
127 do. 127 589 why do. hy 638
128 do. 128 577 144.3 Side road south
129 do. 129 569 Wak RR.
130 do. 130 561 145 Fla. 220 1k5 636
151 do. 131 536 146 do. 145 647
132 do. 132 536 147 do. 147 634
132.4 Myakka River 148 do. 148 650
133.“ Fla. 220 133 543 |] 148.4 gunction Fla. 220, U.S. 31
134 do. 134 547 {1148.6 Sharp, turn to north
135 do. 135 527 «|! 148.8 Sharp turn to west
136 do. 136 52h || ako 149 667
137 do. 137 514 149 2 miles south of Sarasota
138 do. 138 5el 150 Fla. 220 150 7OL
138.9 Side road south '150 On Bay Island
139s Fla. 220 139 548 1150.6 151 722
140 do. 140 568 1150.6 On Sarasota Beach
141 do. ws 628 I
Florida magnetic traverse F
Vertical |! Vertical
tation magnetic | Station magnetic
Miles Road. number _ intensity || Miles Road number _ intensity
ie) On Beach at Anna Maria i} 13 Fla. 1a 13 orn
fe) 1 45056 |} 13.4 Junction Fla. 18a % U.S. 41
1 2 225, 1h Fla. 18a 14 007
2 3 2s 15 do. 15 006
3 4 203 | 15.2 Turned south on hard surfaced
road
4 5 179
5 Fla. 18a 6 159 16 Fla. 18a 16 44978
5.5 Road turns east” 16.3 Oneco; turned east on Fla. 18a
6.2 West end Fla. 18a 16.5 R.R. crossing
6.5 Fla. 18a 7 156 17 17 951
17.3 do.
8 do. 8 133
9 do. 9 115 18 Fla. 18a 18 $38
10 do. 10 100 19 do. 19 922
11 do. 11 087 19.3 River. Beginning of dirt road
12 do. 12 068 20 Fla. 18a 20 915
. 22 do. al 921
503 - 18 -


R.I. 3810

E. Much time can be saved in conducting magnetic surveys by a proper
selection and the absolute measurement of base stations as tie-in
points.

F. There is needed a means for auickly determining the absolute mag-
netic value at such base stations. Such an instrument is in pro-
cess of development by the Division of Geophysical Exploration of
the Bureau of Mines.

Florida magnetic traverse A

Vertical Vertical
Station magnetic Station magnetic
Miles Road number ___ intensity j|Miles Road. number _ intensity
Traverse A started at northern tip of |[ 27 Ln 28 901
Key Largo 28 Tavernier 29 he
0 Dirt road 1 4zoh7 | 29 ha 30 885
1 do. 2 265 || 40 do. 31 880
2 do. 3 252 | 51 do. 32 879
3 do. 4 2gk |
4 do. 5 289 32 do. 33 42869
33 do. 3h 857
4.8 Road junction 4a 5h do. 35 864
5 4a 6 291 | 35 do, 36 861
6 do. 7 252 36 do. 37 847
7 do. 8 218
8 do. 9 167 36.8 Islamorada.
37 da 38 808
9 do. 10 101 38 do, 39 167
10 do. 1 Oak 39 do. ho 173
11 do. 12 kagge 4o do. 4D 740
12 do. 13 955
13 do. an 926 4d do, ke 732
42,3 do. 43 718
an do. 15 905 4s do, Ab 691
14 Key Largo Station dy do. 4s 692
15 A 16 89h 45 do. 46 716
16 do. 17 890
17 do. 18 887 45.8 Toll gate
46 do, 47 696
18 do, 19 866 47 do. Me oe
19 do, 20 868 48 do, 4g 697
20 do. al 864. ho Bridge
al do. 22 862
21,7 Rock Harbor 50 a 50 697
50 On Lon, e;
22 da 23 864 | 5a iene Rey 51 698
23 do, ak 871 52 do. 52 690
ek do. 25 881 53 do. 53 663
25 do. 26 877 “
26 do, eT 892

503 -6-




R.I. 3810

Florida magnetic traverse J (Cont'd. )

Vertical | vertical
Station magnetic Station magnetic
Miles Road number intensity || Miles Road number intensity
13 Fla. 22 Ty 1.53 qi Fla. 36 he 503
ns do. 15 4.86 41.4 R.R. crossing
15 do. 16 505 41.5 Junction Fla. 23; Wildwood, Fla.
16 do. 17 18% he Fla. 36 4a 480
7 do. 18 472 43 do. yy 450
18 Fla. 22 19 46h92 yy do. 45 380
19 do. 511 45 R.R. crossing 46 382
19.5 R.R. crossing 46 Fla. 36 47 378
20 Fla. 22 al 518 46.7 Side road south
al 22 525 47 Fla. 36 4S 522
al Junction Fla. 22 & U.S. 19%42]| 48 do. kg 567
21.5 Inverness hg do. 50 581
22 23 600 50 do. 51 539
22.3 Turned left off U.S. 41 via 5. do. 52 529
Fla. 36 , \| 52 do. 53 505
23 Fla. 36 ak 574
52.5 R.R. crossing; junction U.S. 441
ak Rocky dirt 25 595 52.7 Leesburg, Fla.
road 53.7 R.R. crossing
25 Fla. 36 26 608 5k U.S. 4b1 5h 382
26 do. 27 622 55 do. 55 383
27 do. 28 635 |
28 do. 29 622 5 do. 56 UNS
5T do. ST 525
28.7 Pavement begins 57 Junction Fla. 2, U.S. 441
29 Fla. 36 30 615 5 U.S. 441 58 531
29.4 Bridge; Withlacoochee River 59 do. 59 559
30 Rutland 31 613
31 Fla. 36 32 613 60 do. 60 647
61 do. 61 709
32 do. 33 585 61.2 Dead River
33 do. 34 575 62 U.S. 441 62 782
3h do. 35 560 63 do. 63 B46
35 do. 36 548
36 do. 37 548 63.2 Junction Fla. 55
63.5 Tavares
37 do. 38 46533 63.8 R.R. crossing
38 do. 39. 500 64 Junction 6h 4.6905
39 do. ho 501 Fla. 55
4o do. van 560 65 u.Ss. bul 65 955
ho Swamp; filled ground on

highway ‘
503 - 30 -


R.I. 3810

Florida magnetic traverse D (Cont'd.)

Vertical Vertical
Station magr c Station magnetic
Miles Roar mmber intensity !|Miles Road number intensity
68 Trail 69 Bo7 TT ok 95 79h
69 do. 79 863 j 95 96 770
70 do. 72 854 96 oT 139
7 do. 72 835 oT Fla. 29 98 708
72 do. 73 Ble 98 Filled ground 99 654
73 do. Th 859 99 do. 100 647
Th do. 15 So 100 do. 101 607
74.1 Turned north toward Palmdale 101 do. 102 594
74.3 Miles R.R. crossing at Hall 102 do. 103 548
City 103 do. 104 502
75 76 856
104 do. 105 46
vb) Going north toward Palmdele 105 do. 106 h@e
76 7 856 106 do. 107 497
7 78 860 ||107 do. 108 517
77.8 RR. crossing 108 do. 109 537
78 79 857
109 do. 110 560
78 Turned off on surfaced road; 110 do. 111 561
about 1 mile south of Palméalejj/111 do. 112 603
719 80 837 ine do. 113 621
19 Entering Palmdale 113 do. 1s 636

79.2 Turned right in Palmdale

heading toward Lakeport 620
80 81 877 124.3 Fla. 29 pavement
81 82 895 115 Fla. 29 116 643
82 83 89h 116 Filled gyound 117 675
83 8h 880 !
Eb 85 901 (/127—s Fla. 29 118 44687
us 119 719
84.1 Crossed bridge over ary creek //119 Junction Fla. 29 & Fla. 19h
85 86 4uge6 119 120 730
86 87 934 120 Pla. 19h 12 739
87 88 905
88 8&9 884 jer do. 122 115
: 1e2 de. 123 TAT
89 90 e57 — |i1a3, do. rok Th6
90 91 eg nok do. 125 TAL
91 92 846 Ines do. 126 716
ge 93 833
95 In Lakeport 9h 835
503 ~ 1h -


R.I, 3810

Florida mgnetic traverse G (Cont'd.)

Vertical | Vertical
Stetion magnetic Station magnetic
Miles -Road _-mumber__-intengity || Miles Road number. intensity

32 Fla. 30 gl me Tah On concrete road, heavily fenced

: doe 92 780 115 115 635
93. do. 93 795° {116 116 Pat

93.1 Road turns north for about 117 117 632
1 mile and then turns west [47 Turned west on old road
ogain . ! :

. 118 118 64d
gk = Fla, 30 ou SuE 119 119 669
95 do. 95 860 |}120 120 697
95.4 RR. crossing W121 121 723
96 = Fla, 30 96 84 il1ee 122 THT
97 dow 97 765 |

123 123 776

98 do. 98 Sah 12h 12h 805

98 East Edge Fort Meede, Fla. " 124.8 Cross road; Fort Lonesome

99 Fle. 30 99 79 125 125 827

99 Junction with U.S. 17 126 126 855

»3 RR. crossing Fort Mead .

99.3 RR. crossing Fort ede 127 127 839
100 Wost edge Fort Meade | 128 In slough 128 822
100 100 792 «229 129 746
101 101 160 130 Filled ground 130 « 675
102 102 776 (|| 132 bl: 598
102.6 RR. crossing | 132 132 523

. 132.9 Road junction

0 .
toh 108 BB 3 135 wT
104.6 Turned south; road junction st 4 R. 45h 392
105 105 718 34.4 RR. crossing
105.6 Turned west aged : 154.6 Wimauma, Fla.

. wrned west again 1 1

106 106 680 1 : 38 221
107 107 702 136.7 Junction U.S. 41
108 108 70k 137 137 387
109 109 708

. 138 138 405
109.9 RR. crossing | 139 139 451
110 110 45689 |! 140 140 451
110.6 Center phosphate mine’ . 1141 141 56
111 111 693 1he 142 480

111.7 R.R.; east edge Brewster
7 ; as Bee 142.4 RR. crossing

112 ie 673 142.8 Ruskin

112.2 Brewster,’ Fle. , 12.9 U.S. 5h

112.7 Turned south 145 145 482
113 113 671 143.7 Turned south

1h a4 57 anh Uh 497

144.3 Swung back to U.S. 541
503 - 23 -


R.I. 3810

Florida magnetic traverse B (Cont'd.)

Vertical | Vertical

Station magnetic Station magnetic
Miles Road. number intensity || Miles Road number _ intensity
61 U.S. OF 62 U3R77 90 U.S. Ob 90 727
62 do. 63 466 91 do. 91 740
63 do. 6h 450 92 do. 92 754
64 do. 65 Wha 93 do. 93 768
65 do. 66 ok 93.5 Road goes off south to

Marco Beach

66 do. 67 hoe 94 U.S. G4 oh 43763
67 do. 68 410 95 95 764
68 do. 69 hoz 96 do. 96 7716
69 do. 70 kag oT do. 97 766
70 do. 71 hes } 98 do. 98 766
lh do. 12 43h | 99 do. 99 762
72 do. 73 dha 100 do. 100 754
713 In Ochopee Th 431 101 do. 101 Th
Th U.S. Ob 7D 481 102 do. 102 736
15 do. 76 501 || 103 do. 103 729
76 do. 77 51. 104 do. 104 729
77-5 do. . 78 509 || 105 do. 105 720
77.5 Road junction, Fla. 164 106 do. 106 712
78 R.R. crossing 107 do. 107 7OL
19 U.S. G4 79 532 , 208 do. 108 TOK.
80 do. 80 535 | 109 do. 109 692
81 do. 81 535 109.9 R.R. crossing
82 do. 82 568 110 U.S. 41 turns north
83 do. 83 578 110.2 U.S. 9h 110 670
8h do. 8h 604 111 do. 111 696
85 do. 85 622 111 On beach, Naples, Fla.
86 do. 86 652
87 do. &7 683
88 do. 83 698
89 do. &9 711

503 -9-


Loughmane:*°

or
Davenports*” ON
~ Ugtaines Wy “hot
k Lake Parker ‘% 4 2% City < + Holopaw -
Flant City so 17 68 7K Lake Alfred bo Pa 130
Nae yan Aa 3° * L~Auborndale

“or * Getiner

eland
Mango

FLA. 23_

“+. Deer Park

S192" 6,

x fort Lonésome

Brewstéro!
120

Lake

lue Cypress

FIGURE 5- TRAVERSE CHARTS OF G AND H.


R.I. 3810

Florida magnetic traverse 0 (Cont'd. )

Vertical Vertical
. Station - magnet. Station magnetic
Miles Road number intensity || Miles Road nuriber intensity
60 U.S.E.D. BMGW27, Lake Bryant 96 U.S. 17 96 46181
Ranger Station . 97 do. 97 218
62 Fla. 19 ' 62 46772 98 do. 98 203
63 do. 63 772 99 do, 99 068
64 do. 64 793 100 do. 100 926
65 do. 65° 820 101 do. 101 75h
66 do. 66 825 101 At junction U.S. 17 & 92; 500!
67 do. 67 825 west of intersection
68 do. 68° 834 || Lor 101A 778
69 do. 69 813 101 101A is 700' east of highway
intersection
70 do. 70° 836
7 do. 71 774 102 U.S. 92 102 756
72 do. 72° 758 103 do. 103 797
73 do. 73 TAL 104 do. 104 829
Th do. Th 746 105 do. 105 845,
‘ 106 do. 106 874
75 do. 75 738
76 do. 76 733 107 do. 107 789
17 do. 17 736 108 do. 108 7aL
78 do. 78 The 109 do. 109 665
78.9 Junction Fla. 19 & 55 at 110 do. 110 652
Astor Park _ 111 do. 111 649
719 Fla. 19 19 THT 112 do. 112 654
80 do. 80 762 113 do, 113 654
81 do. 81 751 ay do. 114 673
82 do. 82 783 115 do. 115 €70
82 Astor . 116 do. 116 685
8&3 do. 83 855 17 do. 117 686
83.5 Bridge across St. Johns River 118 do. 118 728
8 Fla. 19 on 950 119 do. 119 713
8&5 do. 85 926 119 Opposite Gun Club
86 do. 86 903 120 do. 120 769
87 do: 87 878 121.8 F.E.C. R.R. crossing
88.1 do. 88 830 121.35 U.S. 92, edge of town
89 U.S. 17 89 785 122.3 do. 122 809
90 do. 90 . 771 122.3 ° Edge of Halifax River, made ”
91 do. o1 Tok lands
92 do. 92 804
93 do. 95 885
93.5 do. 93a 934
on DeLeon Spgs. 94 4.7006
95 U.S. 17 95 112

503 - 45 -


R.I. 3810

Florida magnetic traverse J (Cont'd.)

Vertical | Vertical
Station magnetic . Station magnetic
Miles Road. number intensity |i Miles Road, number intensity
66 66 oak” |" ok” Fla. 57 ok Chi
66.8 Road junction oh Turned left
67 67 943 || 95 Fla. 57 95 ghe
68 68 OL7 95.5 Edge of city
68.7 Mt. Dora, Fla. 96 Fla. 57 96 47011
|
69.2 69 911 | 96.3 St. Johns River
69.6 Turned left, Fla. 4b | oT Fla. 57 oT L69h9
70 Fle. 4k 70 954 98 do. 98 gh5
71 do. 71 978 99 do. 99 47012
72 do. 72 981 |] 100 do. 100 078
73 do. 73 958 || 101 101 096
7h do. Th 900 Hl a01 R.R. crossing; Osteen
74.3 R.R. crossing 102—sFla. 57 102 121
74.4 Sorrento 103 do. 103 173
15 Fla. 4h 15 862 104 do. 104 165
|
76 do. 76 810 |} 105 do. 105 135
17 do. 17 &i9 | 106 do. 106 o14
78 do. 78 812 |) 107 do. 107 4.6980
719 do. 79 766 |} 108 do. 108 47000
80 do. 80 774 || log do. 109 031
|
80.3 R.R. crossing 1210 do. 110 056
80.7 Fla. 4b 81 811 111 do. 111 086
82 do. 82 875 112 do. 112 100
8% do. 85 959 113 do. 113 097
83.5 River 114 do. 1214 061
1
8h Fla, 4h Bh 47005 4) 115 ao. 115 47040
85 do. 85 020 116 do. 116 oho
86 do. 86 695k 116.5 Semsula
87 do. 87 861 117 Fla. 57 117 068
87.1 Cross road 118 do. 118 107
88 Fla, 4h 88 46816 |} 128.5 gunction Fla. 75
eg do. 89 909 119—sFla. 75 119 120
89.7 Cross road 120 do. 120 069
90 Fla. 4b 90 864 121 do. 1e1 053
91 do. 91 842 122 do. 122 032
92 do. 92 791 125 do. 103 46984
93 do. 93 7i5 || Lek do. 124 940
93 R.R. freight depot 124.5 Blencoe
93.1 Junction U.S. 17, U.S. 92, 125 “Fla. 75 125 958
Sanford l| 126 do. 126 982
93.3 Turned right on Fla. 57 H
503 - 31 -


Florida magnetic traverse K (Cont td.)

R.I. 3810

Vertical © Vertical

Station magnetic Station magnetic
Miles Road nunber intensity ||Miles_ Road number intensity
23 Fla. 75 25 700 || 52.8 RR. crossing
ah do. 26 748 || 53° Fla. 100 55 432
2h.2 Side road | 5h do. 56 459
25 Fla. 75 27 642 55 do. “57 488
26 do. 28 640] 56 do. 58 501

|

27 do. 29 611 57 do. 59 510
27.9 R.R. crossing 58 do. 60 534
28 «Fle. 75 30 57 59 do. 61 558
28.1 Junction U.S. 17 (Deland, Fla. )|| 60 do. 62 567
29 Fla. 21 31 6he 60.8 Junction with Fla. 38
30 do. 32 65h 61 Pla. 38 63 597
40.8 R.R. crossing | | 62 do. 64 640
31 Fla. 21 33 654 63 do. 65 642
31.4 RR. crossing 64 do. 66 619
32 Fla. 21 3h 631 65 do. 67 595
33 -d9. 35 636 66 do. 68 46561
33.7 St. Johns River 67 do. 69 5el
33.9 Junction Fla. 100 68 . do. 70 493
3h Fla. 100 36 647 69 do. 71 555
35 do. 37 638 70 do. 72 Shy
36 do. 38 46622 71 do. 13 509
37 do. 39 637 71.3 Junction U.S. 441; Weirsdale
38 do. ho 648 71.4 R.R.. crossing
39 do. AL 690 72 Fla. 38 Te 528
ho do. he 706 3 do. 75 535
yr do. 4a 692 73.4 Side road
ho ao. day 686 74 Pla. 38 76 532
4a do. 45 670 74.7 Side road
yd do. 46 667 715 Fla. 38 ae 560
4,2 Paisley 76 do. 78 593
AS Fla. 100 47 608 77 do. 719 610
46 do. 48. 566 78 do. 80 598
47 do. hg 552 78.4 R.R. crossing .
48 do. 50. 517 78.5 Junction Fla. 23
kg do. 51 518 19 Fla. 38 81 599
50 do. 52 503 80 do. * 82 612
D1 do. 53 479 61 do. 83 654
51.2 Road junction 82 do. 8h 647
52 5h 469 8 do. 85 630
52.7 Junction Fla. 55, Altoona 85.4 Turned north; Pedro via 239
503 - 33 -


R.I. 3810

Traverses I and J are shown in figure 6. Both traverses were regular. It
should be noticed, however, that traverse J, between stations 127 and 151, is
measured parallel to the Atlantic Ocean coast line.

Traverses K, K', L, and O are shown in figure 7. All of these traverses
were regular. Traverse K' was made around the York well, whose location is
better seen in figure 1. It should be noticed that New Smyrna Beach is common
to both the J and K traverses.

Traverses M, N, and P are shown in figure 8. Gainesville, the second base
station, was on traverse M. The area around Jacksonville on traverse P con-
tained possible uncertainties due to buried iron.

CHARTING OF MAGNETIC OBSERVATIONS

Although little difficulty is experienced in charting magnetic values on
small-scale surveys comprising small areas or regions, the problem becomes more
complicated for State-wide surveys. Both major and minor magnetic anomalies
and the structural and tectonic features associated with them may be important
in their relation-to possible oil accumulations. Intimately tied into these
magnetic anomlaies are changes due to latitude and longitude, and it was a
difficult matter clearly to separate the effects of all of these different
factors. It was finally decided to represent the magnetic observations as
a continuous surface passing through the actual measured values in the form
of the magnetic,relief map shown in figure 9. This map was prepared by (1)
constructing a model of the magnetic measurements, (2) photographing the
model, and (43) stippling the surface of the model in the photograph to bring
out the magnetic relief.

The large features sought for in oil-exploration work are clearly defined
on the relief map. It will also be moted that had the customary magnetic con-
tour maps been drawn it would have been difficult to envisege so well the full
meaning and value of the magnetic survey. .

It is seen that the general cffect of latitude is gradually to raise the
magnetic relief surface as the northern portion of the peninsula is approached.
If the averages of the magnetic values for each traverse are plotted against
the average latitude value for the traverses,a straight line is obtained, from
which only two points, those of traverses C and J, depart in any marked degree.
The average change in vertical magnetic intensity per degree of latitude was
942 gammas. Considering the Florida Peninsula as a portion of a sphere with
values of magnetism forming a sine function of the latitude, the change due
to changing magnetic latitude would be about 450 gammas per degrce of lati-
tude. This leaves a difference of 492 gammas which may be assigned to regional
effects of large geological features in the general area of which the Florida
Peninsula is only a part.

From the relief map it is scen that longitude corrections are more or
less meaningless owing to the difficulty of determining a norm or fundamental
basis of correction. Most of the longitude change is due to regional
geological effects.

503 -y-