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Scientific Investigations Map 3423

U.S. Department of the Interior
parin Sheet 1 of 2
U.S. Geological Survey Pamphlet accompanies map
A. Interpreted resistivity profile of flight line L10060 showing potential paleochannels and eolian sediments near Cedar Rapids, lowa EXPLANATION 91°48" 91°46" 1°44" 91°42’ EXPLANATION
A A Resistivity, in ohmmeters | 8 Bk Wey Resistivity, in ohmmeters
& ag V4
METERS Potential eolian sediments (distinct a‘ y | EG istivi i ight li i i i i i istivi
0 ( ) _ Greater than 400 & ! ‘ C. Resistivity profile of flight line L10310 showing the three interpreted units delineated from the changes in resistivity Greater than 400
Paleochannel alluvial deposits ———— : Cc Cc
250 to less than 400 Z “A » \ METERS 250 to less than 400
A208 al \ ~~ BLAIRS FERRY ROAD mo Glacial till [
200 to less than 250 Palo CGEM 200 to less than 250
| 7 A cI | |
150 to less than 200 A NZ ZL. LTOU6U Ve nN | 150 to less than 200
200 + r—
| a
100 to less than 150 Ne a : 100 to less than 150
\ {+ Hiawatha 200 — L_
60 to less than 100 SS) —| 60 to less than 100
40 to less than 60 40 to less than 60
‘0 ~ 25to less than 40 tora 25 to less than 40
B = AN
=a] 7 ~, 150 [—
15 to less than 25 42°02’ |4] 15 to less than 25
d ]
| | 10to less than 15, she ‘ 10to less than 15
5 to less than 10 5 to less than 10
100 [—
Ito less than 5 100 > | 1to less than 5
Less than 1 Cc £10310 Less than 1
0 1 ‘2 KILOMETERS iz 0 1 2 KILOMETERS
| — FH ; | |
— Airborne electromagnetic Covington — Airborne electromagnetic
° 1MiLe delineation of the ° TMILE delineation of the
VERTICAL EXAGGERATION «15 lithologic unit VERTICAL EXAGGERATION sc15 lithologic unit
DATUM IS GEODETIC REFERENCE SYSTEM 1980 42°00' |] DATUM IS GEODETIC REFERENCE SYSTEM 1980
10391
D
l
ao . ; . . . . EXPLANATION Map image is the intellectual property of Esri and is used herein under license. O 1 2 KILOMETERS: EXPLANATION
B. Interpreted resistivity profile of flight line L10170 showing the various bedrock contact points and potential eolian sediments near Cedar Rapids, lowa ccricte 4 Copyright © 2018 Esri and its licensors. All rights reserved. -—1_,__
Resistivity, in ohmmeters Universal Transverse Mercator, zone 15 0 MILE Resistivity, in ohmmeters
B Bedrock contrast BI North American Datum 1983 D. Interpreted resistivity profile of flight line L10391 showing areas of cultural interference in the data collected near Cedar Rapids, lowa
Potential eolian sediments (indistinct Greater than 400
is) Woodland A g orananen D Cultural interference D’ Greater than 400
250 7 Alluvial i ooalan Resistivity profile along flight line—Number is flight line secti METERS
deposi Bedrock contrast 250 to less than 400 Natural area/park cetstly profile along Hight ine Numberis Hight ine section 250 to less than 400
eposits Airborne electromagnetic flight line 250 > -
Urban area . )
200 to less than 250 Wooded marsh ————_ Airborne electromagnetic study area aol atch Alluvial ved 200to less than 250
tL} a
\ facial till 150 to less than 200 150 to less than 200
q
200 In - \ ——_— |
0 PN . ; 100 to less than 150 100 to less than 150
Np ii 200 — —-
7
TT 80toless than 100 , 5 Study area 60 to less than 100
40 to less than 60 ¢ 40 to less than 60
150 = 25to less than 40 g i 25 to less than 40
150 4 -
15 to less than 25 y 15 to less than 25
10 to less than 15 | 10 to less than 15
5 to less than 10 5 to less than 10
100 + r—
1to less than 5 g 100 > [— 1to less than5
Less than 1 Less than 1
0 1 2 KILOMETERS: 0 1 2 KILOMETERS
| | | IOWA |
I T —— Airborne electromagnetic | T Airborne electromagnetic
0 1 MILE delineation of the 0 1 MILE delineation of the
lithologic unit 7 ic unit
VERTICAL EXAGGERATION x14 movogieum VERTICAL EXAGGERATION x15 lithologic unit

DATUM IS GEODETIC REFERENCE SYSTEM 1980 DATUM IS GEODETIC REFERENCE SYSTEM 1980

Figure 4. Examples of delineated lithologic changes interpreted from four selected resistivity profiles within the study area (Deszcz-Pan and others, 2018). A, resistivity profile A-A’ for flight line L10060; B, resistivity profile B-B’ for flight line L10170; C, resistivity profile C-C’ for flight line L10310; and D, resistivity profile D—D' for flight line L10391.
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. . . . . . . . . Suggested citation:
Delineation of Selected Lithologic Units Using Airborne Electromagnetic Data near Cedar Rapids, lowa ne eee eee eee eee ae

9-p. pamphlet, https://doi.org/10.3133/sim3423.

B This map is offered as an online-only, digital publication. Users should be aware that, because of differences in

y rendering processes and pixel resolution, some slight distortion of scale may occur when viewing it on a computer

Joshua F. Valder Adel E Haj Emilia L Bristow and Kristen J Valseth screen or when printing it on an electronic plotter, even when it is viewed or printed at its intended publication scale.
. 1 . A . A .

2018

ISSN 2329-132X (online)