UNITED STATES DEPARTMENT OF THE INTERIOR
GEOLOGICAL SURVEY

SEt sec. 6, T. 38., R. 21E.

, Uintah County, Utah, on south-dipping monocline. Sampled exposure previously stripped by bulldozer to supply fill for earth dam. Beds strike N. 71° E., dip 8° S.

ROCK CANYON SECTION

BULLETIN 1007 PLATE 5

a |
~ Bed| Description concentrated Semple 205 203 2! 20s .)| through | insol-
a Percent P05 Athologic sequence) ot, me a eS, no. _ | (percent)| (percent)| (percent) (percent) | jot tton uble
Fe : o medium coarsely oolitic, soft, light olive-gray to yellow-gray, |
u u 0 i i Mudstone: phosphatic, calcareous, finely to me y » »
2 3 a ad 8 y | re |26 |""tisstie; Rourdont saail gastropods, phosphate pellets 0.5 to 1.0 mn in diamotor and averaging 0.7 mm Moderate DMK-51-47 Ta Bhat
pr phosphatic pellets and oolites concentrated in layers; grades from unit oe aime, ausiy FTI

Mudstone: sphatic, calcareous, medium coarsely oolitic and finely pisolitic, medium-hard, dusky ye. T 1

r See Se on ovinhe rey, thin-tedded; abundant small gastropods; phosphatic pellets, ranging fron 2 to 3m and | Noderate to IMK-50-47. 10.4! 3. 2.12) 0.011 16.1) 37.0
Sa abel a4 25| averaging 2.5 mm, and oolites concentrated in layers; calcite and chert in vug fillings; grades from strong |
ra unit below. _ — —
are Phosphate rock: very finely and very coarsely oolitic, soft, weak yellowish-orange to weak-olive, thin- Secu Dac =a eal =9r Poni 9.1 3.5
im Saat 2-2 24 | ““pedded, limonite coated; contains abundant small gastropods (1 to 2 m). sat -
: - Wadstone? calcareous, phosphatic, Finely and medium coarsely oolitic, hard, weak-yellow, thin-bedded;
| Toe calcareous, apgillaceous, wedium coarsely colitic, soft, pale-olive to yellowish-eray, — as ai 3al eer] 008 aa) Se
Phosphate rock and widstone? calcareous, two beds of very Finely to Finely oolitic, soft, ght olive-aey, | strong and a ee “al 6a
| on | rere te asca’prccphate rock totaling 114 fe in thickness interbedded vith two beds’ of Light olive-gray ad
fissile mudstone; grades from unit below. _ x
Phosphate rock: calcareous, finely oolitic and pisolitic, hard, light olive-gray to pale-olive, thin- ‘Strong DMK-45-47 20.8] 1.8] 1.57 1008) 8.8 25.2
20 | “bedded; few chert nodules 0.02 to 0.05 ft in diameter; grades from unit below. it a
~~} Phosphate rock: calcareous, argillaceous, finely to medium coarsely oolitic, medium-hard, pale-olive, thin- | stong DMK-H4-17 21.6| 3.3 1.86 +015 7.3) 25.9
10 19 | “pedded; contains fewer oolites in lover 0.3 ft; contains few tron oxide nodules; grades fron unit velow. 7
7 Phosphate rock: calcareous, argillaceous, finely to medium coarsely oolitic, soft, pale-olive, thin- |
| 18 | oeddeds Timonite stained; contains fev small gastropods and Phosphate peliéts, whiten range fun 0.6 to strong DAK -13-47 ig. 5.4 1.90 2015; 7.3| 0 Shel
1,5 mm’ and average 0.3 mm in diameter; more phosphatic in lover 0.4 ft. is _
Mudstone: josphatic, calcareous, finely to medium coarsely oolitic, soft, dusky yellow, fissile, limonite
a7 | Stained of bane; conteine phosphate pellets renging tron 0.3 to 0.5 am and averaging 0.4mm in Glaneter; | Strong DMK-42-47 12.4 15 2.70 .019 124] 36.7
in irregular contact (relief of 0.1 ft) with unit below. oo -

Madstone: phosphatic, calcareous, finely to coarsely oolitic, cherty, had, weak yellow-green, thick — |

16 | “Gedaed, imonite stained; contains phosphate pellets, ranging fron 0.5 to 1-0 m and averaging 0.6 amin | Strong DMK-H1-47 8a 2.a| 2.78] .008 9.9| 54.7
diameter. —_ _

1g | Pioephate rock: calcareous, Finely to medium coarsely colLte, soft, browntsh-grey to pele-olive, thin- Daho¥7 25 22) ne _ 38 13.6

bas | bedded; contains abundant small gastropods (0.1 to 0.4 mm in diameter). _ - - i Tr

Th TMadstone: phosphatic, calcareous, soft, dusky yellow, thin-bedded; in irregular contact with unit below Very strong BS Jett ng 43 33 -0e6 Sit ee

13 [Mudstone: siliceous, hard, light brownish-gray, thin-bedded; grades from unit below _ Weak Sava zi i 5 J 3.4]

jp [Mudstone: phosphatic, soft, pale-olive, thin-bedded, contains well-developed joints 0.2 ft apart; includes TIMK-37-47 10.0] 8.7 2.67 026 5.1 60.2
Lamina of iron oxide at base. = : = “of wa.9|

Ti | Phosphate rock: _cl ‘hard, pale parplish-blue, thin-bedded - i ET od 32 Le 23/129

10 |Mudstone: phosphatic, ferruginous, very colitic, soft, light-brown, thin-bedded — . R

Mudstone: phosphatic, calcareous, finely to medium coarsely oolitic, hard, light Olive-gray, thick-bedded; “| yogerate ‘DMK-34-47 18.2 1.3) 1.43) 24) 48.5

contains milky to Diue chert in’vugs a lerge es 0.05 ft in diameter; grades from unit below. é oe rr 3.8 65t she

Madstone: phosphatic, contains few very fine oolites, soft, pale-olive, fissile : 33-7 oT r R R

Mudstone: phosphatic, calcareous, medium cosrsely oolitic, soft, brownish-gray to pale-olive, thin-bedded; | strong 3.0 L15 3.7) 48.2

grades from unit below. - - pea —|—

Phosphate rock: calcareous, glauconitic (?), silty, medium coarsely aunt reer Light olive-gray, thick- | strong 1.3) 1.10] 010 5.5 35.7
| bedded, contains angular chert pebbles (?) in top 0.1 ft; grades from unit below. _ : :
| Phosphate rock: calcareous, finely to medium coarsely oolitic, soft, weak-olive, thin-bedded _ Strong 2.2] 1.32 | 7005] LE 2

Limestone: silty, contains few fine to mediui-coarse oolites, hard, psle-olive, thick-bedded Strong 218

Madstone: phosphatic, contains few Tine oolites, soft, moderate olive-brown, fissile ~ : =

: i Mudstone: calcareous, phosphatic, finely to medium coarsely oolitic, sandy, soft, pale-olive, thin-beddeds | strong x-e7-47 | 28.2! | pray
: contains few small gastropods and layers of large quartz grains. - —-}-
t Sandstone: phosphatic, calcareous, fine to coarse greined, hard, weak yellowish-orange, thin-bedded; contains! yoserate TwK-26-47 7.0 | 39.3
NUL single Plagioglypta and 0.1 ft coarse sandstone near middle; grades from unit below. |
BRUSH CREEK GORGE SECTION
SWENWH sec. 92, T. 25., R, 22, (unsectioned patented land), Uintah County, Utah, on south-dipping monocline. Section exposed in trench previously dug by Humphreys Phosphate Co. at the bridge
sf
over Brush Creek at the mouth of Brush Creek Gorge. Beds strike N. 80° E., dip 7S. a 7
Thick- Reaction to | Loss| Acid
Sample P20, Al,0, Fe,05 V20s || thr insol-
Percent POs Tatactosts seatanoe | poss, Beit Description concentrated non | (perdest) (neréete) |(pertett)| (percent) | {2rousTM | Ansel
Mudstone: calcareous, soft, Might olive-gray, fissile; contains few gastropods and ostracoda; grades — 4 Oe re a6
1.0 | 25 “trreguiarly from unit: below. Weak ‘DMK-25-47, 5.5 7.9
13 py | bimestone: silty, cherty, medium coarsely oolitic, medium-hard, weak yellowish-gray, contains lenses of Vodevate, TMK-24-47 Ls 21 2.67 1008) 25.3; 38.7
|| “chert 0.05 to 0.2 ft in’ diameter, and vugs lined with calcite; grades from unit below. te
Mudstone and chert: four beds of soft, light olive-gray, fissile, calcareous mudstone, ranging from |
0.2 to 0.7 ft in thickness and totaling 1.7 ft; interbedded with five beds of hard, mediun-gray, thin- Strong and IMK-23-47 25 4 3.40 +004, 17.3| 49.8
2.2 2 J
bedded chert, ranging from 0.05 to 0.2 ft in thickness and toteling 0.5 ft; contact with unit below not ‘none |
exposed.
La 2 Magnan calcareous, soft, pale-olive, thin-bedded; contains gastropods; contact with unit below not Weak TMK-22-47 Tc 2.45 12.7; 56.6
7 ‘21 | Mudstone: calcareous, medium coarsely oolitic, cherty, hard, weak yellowish-gray, massive; contains Weak ‘DMK-21-47, 5.4 1.94 27.0 2h.2
EB __ gastropods and ostracods ranging from 1 to 4’um in dismeter and averaging 2 um; grades from unit below. - -
Yj aj 20 | Phosphate rock: calcareous, finely oolitic, soft, pale-olive, massive; contains abundant gastropods and se TMK-20-47 19.1 2.5 1.28) 15.5 14.6
YY a ostracods; grades from unit below.
Yy Ly /}; 15 jg | Phosphate rock: very coarsely oolitic, soft, weak-olive, thick-bedded; abundant gastropods and ostracods; Strong TMK-19-47 28.5 1.8 Lay 94] ha
YY Yj} s more phosphatic in basal 0.6 ft. —_ __
Vy YY, 5 7@|Mudstone: phosphatic, calcareous, Tew very Fine oolites, wedium-hard, pale-olive, thin-bedded; contains Woe TMK-18-47 10.6 3.9 Tair “013 23.0; 20.8
Uo //, : few gastropods and ostracods; grades from unit below.
Vy Yj} Limestone: argillacsous, phosphatic, finely oolitic, upper half soft and lover half hard, Light olive-gray, | wolerete to Taya7 36 zo) 8a6 008 2.6) 16.9
UMMM YT 6 17| ~ thin-bedded; abundant small gastropods and ostracods (7) concentrated in layers; fossils range from 1 to shee
YW) 5 am in diameter and average 2 mm; grades from unit below i
ps ~~|Mudstone and phosphate rock: three beds ‘of very finely colitic, soft, brownish-black fissile, phosphate
Y rock, containing small gastropods and pelecypods and ranging from 0.2 to 0.5 ft in thickness and totaling Strong to | pwK-16-47 16.9 45 2.05) -021| 8.0) 4.4
3.4 16| 1.0 ft; interbedded with three beds of phosphatic, very fine to medium coarsely oolitic, olive-gray, re |
fissile mudstone, containing pyrite (?) crystals and ranging from 0.4 to 1.0 ft in thickness and totaling
2.4 ft; grades from unit below. oe | =
i 15 | Phosphate rock: very finely to medium coarsely oolitic, hard to friable, pale-olive, thin-bedded; contains Moderate ‘DMK-15-47 | 27.2 23 1.17) +009 77] 12.5
ES ostracods (?) and gypsum; in sharp, irregular contact with unit below. ean L
Chert and mudstone: three hard, pale-olive, thin-bedded chert layers, ranging from 0.05 to 0.2 ft in
= 1y| thickness and totaling 0. ft, interbedded with four beds phosphatic, very finely and finely oolitic, Weak IMK-14-47 9.4 3.5] 3.33 +009 Tel] 545
: crumbly, pale-olive mudstone, ranging fron 0.1 to 0.5 ft in thickness and totaling 0.9 ft; contains 1 per-
cent_gypsum anda horn coral; grades from unit below.
7 a Phosphate rock: argillaceous, very finely to medium coarsely oolitic, weak-olive (wet), massive; contains
13 few small gastropods and ostracods, phosphate pellets averaging 2 mm and ranging from 1 to 5 mm in Strong ‘DMK-13-47 27.7 3.2 1.46) 009 | 6.1 13.5
| @iameter, most abundant at base; in sharp, irregular contact with unit below.
~} yp |Madstone: “phosphatic, very finely oolitic, dusky yellow-green, fissile; contains phosphate pellets TMK-12-47 1 7.0 31h vole 7.8| 37.6
| averaging 1.5 om and ranging from 0.5 to 2.5 mm; In sharp, irregular contact with unit below.
"i | qq |Madstone: “cherty, hard, light olive-gray, thick-bedded near top; contains vugs 15 to 25 um in diameter Weak ‘DMK-11-47 Bal 2.2 2.96) 24.7] 35.4
: |“ | Lined with calcite crystals; in sharp, irregular contact with unit below.
jo | Phosphate rock: argillaceous, very finely to finely oolitic, soft, olive-gray, thin-bedded; contains Weak TMK-10-87 2a 2.05] 7.0] 23.5
_| phosphate particles averaging 2 mm with a maximum of 25 mm; in sharp, irregular contact with unit below.
9 | Mudstone: sphatic, contains few very fine oolites, brittle, olive-gra, ‘DMK-_9-47 56 3.11 6.6 bud
ry OF ae
[Phosphate rock: argiilaceous, crumbly, moderate reddish-brown, thick-bedded; THK 8-47 2.8 6.9L T.2h 15.
Phosphate rock: finely oolitic, crumbly, pale-olive, thick-bedded; contains 1 percent gypsum and bladed, = ~ 7a 2.2 2. 6 13.8
3 v disk-shape phosphatic pellets as large as 2 mm in diameter. wosers: DES TAT sa °
pha =
25, [Mudstone: phosphatic, contains few fine oolites in some layers; brittle, olive-gray, fissile IMK= 6-47 10.9 3.5L 6.4] SLT
2.05 5 | Phosphate rock: argillaceous, finely to medium coarsely oolitic, medium-hard, Olive-gray, thin-bedded Moderate ‘DMK= 5-47 2.0 1.55. BI 18.0
a 4 [Mudstone: “contains few very fine oolites, hard, dusky-yellow, thick-bedded Moderate TwK- "4-07 2.8 17h 378 TI.T
ye.
A Mudstone: josphatic, finely oolitic, soft, dark greenish-gray, thin-bedded, contains selenite crystals DMK- 3-47 AT toy 10.2 FLT
a]
2 2|Mudstone: phosphatic, plastic, dusky yellow-green, thin-bedded; sharp contact with unit below DK 2-7 14.8 5.41 12:7
Sandstone: phosphatic, contains oolites and nodules of phosphate as large as 40 um in diameter, fine to medium|
5 1 grained, hard, gray to yellow-brown, thick-bedded; phosphate pellets more abundant at base; grades from ‘DMK- 1-47 1.9 2.38 2.4 AL
Weber sandstone velov. - —
LITTLE BRUSH CREEK SECTION
SE{NEt sec. 22, T. 28., R, 22 E. (unsectioned patented land), Uintah County, Utah on south-dipping monocline, Sampled north of Humphreys Phosphate Co. road, 1 mile west of Little Brush Creek.
a Exposure consists of natural outcrop further excavated and bulldozed by Humphreys Phosphate Co, Beds strike N. 50° E, » dip 7° S.
| Thick- - Reaction to 7 - Loss Acid |
Percent P40, Lithologic sequence] “ness, |Be4 Deseription Consentrates | Sample | | Fe0p |” Aig0s | Peas | vals | enrcumn | tnaal~
| eet (fest) [20 no. | (percent) |(percent) |(percent) |(percent) | senition | “urie
-o ~ — . ‘ - |
U pa T T T sS—.
30 25 20 6 10 5 = Mudstone and chert: eight beds of very finely to medium coarsely oolitic, soft, dusky yellow-green calcareous |
pa eee 5.0 23 | mudstone, containing phosphate nodules concentrated in layers; interbedded with seven beds of fissile hard, | Weak merict7 2.9 58.2 |
pale purplish-blue, thin-bedded chert. - |
Le Midstone: phosphatic, very finely to finely oolltic, soft, pale-olive, thin-bedded, contains anall gastropods =a -
ses a a a Sep ee pT ino Serone Eid od) ar] 8.7)
3 S=Ses: Mudstone: phosphatic, calcareous (?), contains few very fine to medium-coarse oolites, hard, light-gray to
bepese F 21} weak-red, thin-bedded; contains vugs as large as 0.1 ft in diameter, and phosphatic pellets in some lami- | strong ‘DMK-72-47 11.9 2.2 1.61 0.069 15 | 4a
La Sesas nae, ranging from 0.5 to 1.0mm and averaging 0.75mm in diameter; in sharp irregular contact with unit below.
Boose Madstone: phosphatic, very finely to medium coarsely oolitic, medium-hard, weak yellow-orange to weak-olive,
oR esene n.0 20 | thin-bedded; contains small gastropods and ostracods; contains phosphate pellets (principally fossils) in Strong IMK-71-47 16.7 25 1.54 7.6} 17-5
_ sone laminae, ranging from 2 to 4 mm and averaging 3 mm in Glaneter; grades from unit below. {
| Secs Phosphate rock: very finely to medium coarsely oolitic, soft, pale-olive, fissile; contains few small ~ ~ ~
Seces y
= 9 19 | gastropods in some laminae and phosphate nodules 2 to + um in diameter, in sharp irregular contact with Strong, DMK~70-47 19) 1.2 O14 9.2] 15.2
| _ unit below. —_ -
[Mudstone: phosphatic, mediun coarsely oolitic, hard, olive-gray to light-eray, massive; contains Tew
[ are |
4 18 | ostracods and gastropods, calcite-lined vugs, irregular calcite masses, and pyrite crystals; in sharp Strong DMK-69-47 Re 1.32 12] 51.3
irregular contact with unit below. :
oe 17 [Mudstone: argillaceous, few very fine to fine oolites, medium-hard, yellowish-gray, thick-bedded Strong DWK-68-47 2.5 1.39 I 17-7 a6
= sf : Phosphate rock: silty, contains few very fine to medium-coarse oolites, soft, light olive-gray to weak =
Naracaedl es? 16 | olive, thin-bedded; ‘more phosphatic at base, contains abundant. gastropods and ostracods. eee Eagle wn) __2:8 2:08) Sa] EMT
b10 LEN. uy 15 Limestone: silty, very finely to finely oolitic in some laminae, medium-hard, yellowish-gray, thin-bedded Moderate TMK-66-47 6.5 3.0 Tak T 30.2 18.2
=1s= Phosphate rock: silty, very finely to medium coarsely oolitic, soft, pale-olive, thin-bedded; contains i "
a 4 | “orbiculoids; more phosphatic at base; grades from unit below. _ Strong TAKS, Gh 3.6 16 | Bie] 1658
IN a 13 |Madstone: phosphatic, calcareous, medium-hard, palée-olive, thin-bedded Weaic DOK-6h-47 T4.6 5.2 2.52 1 128 | 32.3

Phosphate vock: silty, finely to medium coarsely oolitic, soft, pale olive-gray, fissile; contains vags %

\ es 12 | siiiea with chert and calette; in sharp irregular contact with unit below. : Rerons TAE-O257 bas 5:5 2.34 Goo] 5.0 | 32.6

Mudstone: cherty, hard, dark reddish-gray to light olive-gray, thin-bedded; vgs Lined with chert and

| -3_ 2 |" calcite as larg’ as 0-1 ft in dianeter; in sharp irregular contact with unit below. — eel 65 _ 2.19 ET) 10a
Phosphate rock: finely to medium coarsely oolitic, soft, pale-olive, fissile; contains fragnents of purple 7
p-6 aa chert and a few calcite veinlets; grades from unft below. data} T-61-47 27-5 all 2.39 64 ET
Lis Mudstone: finely oolitic in sone laminae, hard, light olive-gray, thin-bedded; grades from unit below Weak BRK-BO-NT 6.8 SA 5.10 wr ort
I Phosphate rock and madstone: two beds of very finely to medium coarsely oolitic, soft, weak ollve-areen,
| fissile phosphate rock, containing ostracods and including phosphate pellets totaling 1.4 ft in thickness; Strong ant: TMK-59-47 a2et Sek 29 8.6) 23.8
| and one 0.2 ft inter-bed of finely colitic, soft, dusky yellow-green, thin-bedded, phosphatic mudstone. bs
| Mudstone: calcareous, very finely to medium coarsely oolitic in some layers, hard, light olive-gray, —— |
7 | thin-bedded; contains chert nodules as large as 0.05 ft in diameter; in sharp, very irregular, contact with | Strong IMK-58-47 5.6 2.1; 3.03 12.9] 54.0}
unit below. | |

Phosphate rock: very finely to wedlum coarsely oolitic, soft, olive-gray, thin-bedded; contains phosphate —_

9 6 | pellets ranging from 0.2 to 0.5 mm and averaging 0.4 am in diameter; in sharp irregular contact with unit Moderate DMK-57-47 2.9 2a 1.61 10.7
a below.
| 5 5 |Mudstone: “phosphatic, soft, pale-olive, fissile ‘DMK-56-47_ 12.4 00. 53.0
+20 e.2 4 [Phosphate rock: very finely to medium coarsely oolitic, medium-hard, softer at top, weak-olive, massive Moderate ‘TMK-55-4; 28.2 TUE — 15.9
cz a

8 Limestone: silty, wedium coarsely colitic in parts, hard, dusky yellow, thick-bedded - Moderate DK 54-17 5.6 LT | iB

Madstone: phosphatic, medium coarsely oolitic in some layers; soft, plastic, dusky yellow, fissile; in ae
a 2 | sharp irregular contact with unit below. — Noak ToK-55-47 | 12.3, 4.57 4a

Sandstone: fine-grained, hard, yellowish-gray, thin-bedded, grades from sandstone-of the underlying

Es > ["Weber sandstone (probably revorked Weber sandstone] _ Stxong Pm ne-AT. ayo Ea ATS

L_

Section measured by D. M. Kinney and J. F. Rominger in August
1947 and sampled by R. P. Sheldon in September 1947.

CHARACTER AND COMPOSITION OF ROCKS IN THE LOWER PART OF THE PARK CITY FORMATION

Chemical analyses by U. 8. Bureau of Mines

495163 O - 55 (In pocket) No. 5