Three Geologic Cross Sections Across Portions of Eastern...

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Three Geologic Cross Sections Across Portions of Eastern Nebraska Showing Quaternary Lithologic Units and Stratigraphy of Uppermost Bedrock Jesse T. Korus 1 , Dana P. Divine 1 , Paul R. Hanson 1 , and Jeremy S. Dillon 2 Author affiliations: 1. Conservation and Survey Division, School of Natural Resources, University of NebraskaLincoln 2. Department of Geography, University of NebraskaKearney Correlations and Cross Sections (CCS) 18 Conservation and Survey Division School of Natural Resources Institute of Agriculture and Natural Resources University of NebraskaLincoln Lincoln, Nebraska 2012

Transcript of Three Geologic Cross Sections Across Portions of Eastern...

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Three Geologic Cross Sections Across Portions of Eastern Nebraska Showing

Quaternary Lithologic Units and Stratigraphy of Uppermost Bedrock

Jesse T. Korus1, Dana P. Divine

1, Paul R. Hanson

1, and Jeremy S. Dillon

2

Author affiliations:

1. Conservation and Survey Division, School of Natural Resources, University of NebraskaLincoln

2. Department of Geography, University of NebraskaKearney

Correlations and Cross Sections (CCS) 18

Conservation and Survey Division

School of Natural Resources

Institute of Agriculture and Natural Resources

University of NebraskaLincoln

Lincoln, Nebraska

2012

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Introduction

Three cross sections were constructed across portions of eastern Nebraska to characterize the

regional geology of unconsolidated Quaternary deposits and the bedrock units that lie directly

beneath them. The locations of these cross sections are shown in Figure 1. Lithologic data were

obtained primarily from historical test hole logs drilled by the Conservation and Survey Division

(CSD). These test holes were drilled specifically to investigate subsurface geology and therefore

represent the highest quality data available. Lithologic logs of these test holes are available from

CSD or at http://snr.unl.edu. Additional unpublished test hole logs not drilled as part of the

official CSD test hole drilling program that exist along the line of cross section were reviewed

for quality and reliability. Logs of good quality were used in some places to supplement the

lithologic data. These logs are included in Appendices A-C.

Each of these geologic cross sections was originally drafted by Vince Dreeszen of the CSD.

Although these original cross sections were not published, the originals are archived at CSD.

The geologic interpretations on each of the three cross sections are based in part on the existing

data and Dreeszen’s original cross sections. The correlations of Quaternary lithologic units are

the interpretations of the authors and were made based upon their understanding of the regional

geology and stratigraphy of eastern Nebraska. In general, lithologic units greater than 10 feet (~

3 m) thick were correlated between test holes, whereas thinner units were ignored. The distances

between boreholes, which is as much as several miles, are too great to reliably correlate such thin

units. Nonetheless, since the thicknesses of most Quaternary lithologic units in eastern Nebraska

are known to vary considerably over short distances, the units represented in the cross sections

should not be taken to represent actual thicknesses in the areas between boreholes.

Information regarding bedrock stratigraphy was obtained from the geologic bedrock map of

Nebraska (Burchett, 1986), published measured sections from outcrops (i.e. Burchett, 1971), as

well as oil and gas exploration wells within several miles of the line of cross section

(http://nogcc.ne.gov/, see also Appendices A-C).

The elevations of some test holes were determined at the time that the test hole was drilled using

USGS 7.5 minute topographic maps or at a later date using USGS Digital Elevation Models

(DEM). The land surface elevation profiles along the lines of cross section were derived from a

DEM mosaic of the study area.

The position of the water table (or, in some locations, the potentiometric surface) displayed on

the cross sections was taken from a DEM of the water table that was created using water levels

from 1995 as indicated in maps by Dreeszen (2001), Summerside (2001), and Hartung and

Summerside (2001). These maps represent a best approximation of the water table over a large

area. The position of the water table shown on these cross sections was modified locally to

correct unlikely relationships between the water table and land surface.

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Fig. 1. Locations of cross sections and test holes.

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Acknowledgements

This project is part of the Eastern Nebraska Water Resources Assessment (ENWRA), and was

funded through the Lewis and Clark Natural Resources District, Lower Elkhorn Natural

Resources District, Lower Platte North Natural Resources District, Lower Platte South Natural

Resources District, Nemaha Natural Resources District, Papio-Missouri River Natural Resources

District, and the Interrelated Water Management Plan Program Fund. Les Howard is

acknowledged (UNL-CSD) for his assistance with this publication.

References

Burchett, R.R., 1971. Guidebook to the geology along portions of the lower Platte River Valley

and Weeping Water Valley of Eastern Nebraska. Conservation and Survey Division,

University of NebraskaLincoln, 39 p.

Burchett, R.R., 1986. Geologic bedrock map of Nebraska (1:1,000,000). Nebraska

Geological Survey, Conservation and Survey Division, Institute of Agriculture and

Natural Resources, University of NebraskaLincoln, GMC-1.

Dreeszen, V.H., 2001. Configuration of the water table, circa 1995, Lincoln and Nebraska City

Quadrangles, Nebraska. Conservation and Survey Division, Institute of Agriculture and

Natural Resources, University of NebraskaLincoln, GM-54.3.

Hartung, S.L., and Summerside, S.E., 2001. Configuration of the water table, circa 1995, Sioux

City Quadrangle, Nebraska. Conservation and Survey Division, Institute of Agriculture

and Natural Resources, University of NebraskaLincoln, GM-54.10.

Summerside, S.E., 2001. Configuration of the water table, circa 1995, Fremont and Omaha

Quadrangles, Nebraska. Conservation and Survey Division, Institute of Agriculture and

Natural Resources, University of NebraskaLincoln, GM-54.5.

It is the policy of the University of NebraskaLincoln not to discriminate based upon age, race, ethnicity, color,

national origin, gender, sex, pregnancy, disability, sexual orientation, genetic information, veteran’s status, marital

status, religion or political affiliation.

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24-B

-64

14-A

-64

23-B

-64

22-B

-64

35-A

-5236

-A-5

2

37-A

-52

38-A

-52

139-A

-5240-A

-52

41-A

-52

10-B

-53

15-A

-5314

-A-5

3

7-B

-53

8-B

-53

Bow

Cre

ek

Eas

t Bow

Cre

ek

Cedar CountyKnox County

350

550

400

450

500

1100

1800

1700

1600

1200

1300

1400

1500

1900Dixon County

2

Cedar County

Ele

vatio

n (fe

et a

bove

mea

n se

a le

vel)

Ele

vatio

n (m

eter

s ab

ove

mea

n se

a le

vel)

Interpretive Geologic Cross Section from Knox County to Dixon County, Nebraska Paul R. Hanson and Jeremy S. Dillon

Kp

Kn

Kc

water table or potentiometric surfacetest hole

Lincoln

West East

Cite as: Hanson, P.R. and Dillon, J.S., 2012, Interpretive geologic cross section from Knox to Dixon County, Nebraska. Conservation and Survey Division, University of Nebraska−Lincoln. Correlations and Cross Sections (CCS) 18.1.

20 0 5 10 15

10 20 300Horizontal Distance (km)

Horizontal Distance (mi)

Conservation and Survey DivisionSchool of Natural Resources

University of Nebraska−Lincoln

The University of Nebraska–Lincoln is an equal opportunity educator and employer.

loess

silt & clay

tillsand & gravel

lithology of Quaternary deposits

Pierre ShaleNiobrara FormationCarlile Shale

KpKnKc

Cretaceous

System Group or FormationundifferentiatedQuaternary

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11-A

-57

1

2-A

-68

2

2-B

-68

3 6-A

-53

4-A

-53

4-LE

-99

5-A

-53 3-A

-53

2-A

-53

1-A

-53 50

-A-5

1

49-A

-51

48-A

-51

47-A

-51

46-A

-51

35-A

-51

34-A

-51

4 33-A

-51 32

-A-5

1

31-A

-51

30-A

-51

9-A

-64

10-A

-64

11-A

-64

12-A

-64

13-B

-64

27-B

-64To

To

Kp

Kn

KcKgg

Pierce County Wayne County Wayne County Dixon County Dixon County Dakota CountyAntelopeCounty

Pierce County

Dry

Cre

ek

Nor

th F

ork

Elk

horn

Riv

er

Dee

r Cre

ek

Dog

Cre

ek /

Sou

th L

ogan

Cre

ek

Loga

n C

reek Mid

dle

Cre

ek

Wig

le C

reek

Interpretive Geologic Cross Section from Pierce County to Dakota County, NebraskaDana P. Divine

West East

400

450

500

550

1900

1800

1700

1600

1500

1400

1300

Ele

vatio

n (m

eter

s ab

ove

mea

n se

a le

vel)

Ele

vatio

n (f

eet a

bove

mea

n se

a le

vel)

20 0 5 10 15

10 20 300Horizontal Distance (km)

Horizontal Distance (mi)

water table or potentiometric surface

test hole

loess

silt & clay

till

sandsand & gravel

sand, silt, & clay

lithology of Quaternary deposits

Cite as: Divine, D. P., 2012. Geologic Cross Section Across Eastern Nebraska from Pierce County to Dakota County. Conservation and Survey Division, School of Natural Resources, Institute of Agriculture and Natural Resources,University of Nebraska−Lincoln. Correlations and Cross Sections (CCS) 18.2.

Lincoln

Ogallala GroupTertiaryPierre ShaleNiobrara FormationCarlile ShaleGreenhorn Limestone/Graneros Shale

ToKpKnKcKgg

Cretaceous

System Group or FormationundifferentiatedQuaternaryConservation and Survey Division

School of Natural ResourcesUniversity of Nebraska−Lincoln

The University of Nebraska–Lincoln is an equal opportunity educator and employer.

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black shale from 106.2-107.3Queen Hill?

Iowa Point

Larsh

Thur

ston

Co.

Bur

t Co.

South Bend LsRock Lake ShStoner Ls

South Bend Ls(miscorrelated)

Hertha Ls

Cass Ls

silt, very clayey,very sandy

“quartzite boulder”

clay, silty, sandy, gravelly, w/ qtzite boulder at 151’

clay, pebbly &gravelly below 80’

contains limestonefragments

pebble-bearingclays below 39’

silty clay& clayey silt

Is within the bounds of till defined

in the Neb. till thickness

map

clay with boulders

containsgravel from10-23’

clay w/gravel &limestonepebbles

?

Bethany Falls Ls

(miscorrelated)should be:Argentine Ls?

Raytown Ls?

Plattsburg LsLane ShArgentine Ls

Raytown Ls

lP-KcL

Stoner LsVilas ShPlattsburg LsLane ShArgentine Ls

lP-M-P

lP-Sh

lP-KcL

lP-D

lP-W

lP-ShlP-W

lP-Ad

lP-P-Cg

Turk

ey C

reek

Washington County Douglas CountyBurt County Washington County

Eric

kson

1

Mar

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Sm

ith 1

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Dar

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4

Zim

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1

Conservation and Survey DivisionSchool of Natural Resources

University of Nebraska−Lincoln

The University of Nebraska–Lincoln is an equal opportunity educator and employer.

12-A

-61

13-A

-61

19-A

-62

18-A

-62

14-A

-61

15-A

-61

16-A

-61

17-A

-61

16-B

-63

17-B

-63

4-A

-67

3-B

-67

2-B

-67

3-A

-67

2-A

-67

1-A

-67

4-B

-40

14-A

-56

13-A

-56

12-A

-56

11-A

-56

10-A

-56

9-A

-56

8-A

-56

7-A

-56

6-A

-56

5-A

-56

4-A

-56

3-A

-56

2-A

-56

1-A

-61

2-A

-61

3-A

-61

1-81

4-B

-73

4-A

-61

5-A

-616-A

-61

7-A

-61

8-A

-61

9-A

-61

10-A

-61

11-A

-61

20-A

-62

21-A

-62

22-A

-62

23-A

-62

24-A

-62

1-B

-62

2-B

-633-B

-63

4-B

-63

5-B

-63

6-B

-63

7-B

-63

8-B

-63

9-B

-63

10-B

-63

11-B

-63

12-B

-63

6-A

-637-

A-6

3

8-A

-63

13-B

-63

14-B

-63

15-B

-63

1

2

3 4

5

6

7

8 9 10

11

12

13

14

[Pkcl

Thurston County Burt CountyS

outh

Bla

ckbi

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reek

Elk

horn

Riv

er

Douglas County Saunders County

Pla

tte R

iver

Saunders County Cass County

Sal

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Cal

laha

n C

reek

Hoo

per C

reek

Littl

e N

emah

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iver

Sou

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Littl

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iver

Otoe County Johnson CountyCass County Otoe County

Nor

th F

ork

Big

Nem

aha

Riv

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Dee

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ek

Yank

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reek P

lum

Cre

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Johnson County Pawnee County

1600

1500

1400

1300

1200

1100

1000

900

800

450

400

350

300

loesssilt and claytillsandsand and gravel

Council Grove GroupAdmire GroupWabaunsee GroupShawnee GroupDouglas GroupKansas City - Lansing GroupsMarmaton - Pleasanton Groupsundifferentiated

Dakota Formation

Ele

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n (ft

. abo

ve m

ean

sea

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l)

Ele

vatio

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Devonian

PermianCretaceous

lithology of Quaternary deposits

[Pa[Pw[Ps[Pd

[Pkcl[Pmp

P[Pcg

D

P[Pcg

P[Pcg [Pa

[Pw[Pa

[Pw

[Pw

[Ps[Pd

[Pkcl

[Pmp

D[Pmp

[Pmp

Interpretive Geologic Cross Section from Thurston County to Pawnee County, NebraskaJesse T. KorusNorth South

water table or potentiometric surface

test hole

oil/gas well (subsurface trace not shown)

fault zone or zone of steeply dipping beds

Cite as: Korus, J.T., 2012. Geologic cross section across eastern Nebraska fromThurston County to Pawnee County. Conservation and Survey Division, Schoolof Natural Resources, Institute of Agriculture and Natural Resources, Universityof Nebraska−Lincoln. Correlations and Cross Sections (CCS) 18.3.

20 0 5 10 15

10 20 300Horizontal Distance (km)

Horizontal Distance (mi)

Pennsylvanian

System Group or FormationundifferentiatedQuaternary

Lincoln

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Appendix A: Additional information used in cross section from Knox County to Dixon County (CCS-18.1)

log ID: 1 legal location: 30N-1E-2

elevation: 1470 ft latitude: -97.27050 longitude: 42.61053

depth (ft)

from to description

0 3 topsoil

3 5 coarse clayey gravel

5 6 hard grey clay

6 25.5 medium sand

25.5 27 light yellow clay

27 29 sand and gravel

29 31 light clay hard

31 34 light clay soft

34 35 soft white clay

35 40 fine white sand

40 43 sandy soft light clay

43 48.5 sandy soft light clay

48.5 49 sand

49 54 light sandy clay

54 57 hard grey clay

57 61.5 soft grey clay

61.5 81 sand streaks-light to dark clay or shale in alternate layers. Soft at 81'

81 87 fine grey sand

87 90 grey shale with fine sand

90 111 very fine sand to fine clean sand (best at bottom). This area could be gravel packed

111 114 light blue clay

114 123 fine grey sand and hard grey clay

123 124 fine sand

124 126.5 sand and medium gravel, green and good

126.5 127.5 white clay, or Niobrara, one streak of yellow

127.5 129 green clay

129 131 mixture of white-green, some shells

131 133 hard dary grey clay or shale

log ID: 2 legal location: 31N-1E-36

elevation: 1344 ft latitude: -97.250263 longitude: 42.617742

depth (ft)

from to description

0 8 roadway fill; clay, silty and clayey

8 12 clay, silty, brown

12 27 gravel and sand, silty and clayey with intermittent layers of silty clay

27 30 gravel and sand, very silty, marly, compact

30 65 silt, clayey, marly, compact to very compact, slightly cemented below 43'. Blue-gray

1

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Appendix B: Additional information used in cross section from Pierce County to Dakota County (CCS-18.2)

log ID: 1 legal location: 27N-4W-32

elevation: 1780 ft latitude: -97.81036 longitude: 42.2676

depth (ft)

from to description

0 3 sand

3 11 yellow clay

11 21 sand

21 80 clay

80 96 coarse sand

96 114 gravel and coarse sand

114 119 clay

119 145 mixed sand and gravel

145 200 sand

200 300 sand and sandstone mixture

300 301 clay

log ID: 2 legal location: 26N-4W-3

elevation: 1730 ft latitude: -97.7618 longitude: 42.2602

depth (ft)

from to description

0 8 sandy clay and sand layers

8 30 clay

30 45 clay and blue clay

45 49 blue clay

49 66 fine medium blue sand

66 80 blue clay

80 94 fine blue sand

94 106 blue clay

106 120 medium coarse blue sand

120 125 fine medium blue gravel

125 129 clay

129 135 sandstone: medium hard; blue-gray

135 150 sand and clay with limestone and sandstone streaks

150 165 sand and sandstone and clay layers

165 180 fine sand

180 210 fine sand and sandy clay layers

210 221 fine sand

221 228 sandy clay

228 238 fine sand

238 240 sandy clay

240 255 sandy clay and sandstone layers

255 261 fine sand and sandstone

261 280 sandy clay

280 290 fine medium sand

290 300 clay and limestone, yellow rock and red rock

1

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Appendix B: Additional information used in cross section from Pierce County to Dakota County (CCS-18.2)

log ID: 3 legal location: 27N-3W-33

elevation: 1637 ft latitude: -97.6594 longitude: 42.2709

depth (ft)

from to description

0 4 top soil, black, very calcareous

4 5 sand, tan, medium, slightly silty

5 7 clay, tan

7 9 sand, medium-fine, very silty

9 21 clay, blue, very silty

21 40 sand, clean, medium-fine, moderately uniform

40 63 sand, clean, very coarse, contains gravel grains and pebbles below 50'; contians trace of gray

silt @52'

log ID: 4 legal location: 26N-4E-4

elevation: 1419.5 ft latitude: -96.9658 longitude: 42.2637

depth (ft)

from to description

0 37 clay, silty, black to 26' then blue-gray

37 45 sand, silty, contains gravel

45 50 gravel, silty, contains sand

50 53 sand, very fine to medium, slightly silty

53 62 clay, very silty, soft, gray

62 80 Carlile: shale, dark gray to black, very hard to 64' then hard

2

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Appendix C: Additional information used in cross section from Thurston County to Pawnee County (CCS-18.3)

log ID: 1 legal location: 24N-9E-1

elevation: 1175 ft longitude: -96.347392 latitude: 42.080408

depth (ft)

from to description

0 57 brown clay

57 62 gray clay

62 69 sandy gray clay

69 80 sandy yellow clay

80 83 rusty sand and gravel

83 99 yellow soft sandstone

99 130 brown shale

130 139 gray shale

139 170 brown shale

log ID: 2 legal location: 18N-10E-33

elevation: 1310 ft longitude: -96.30052 latitude: 41.484548

depth (ft)

from to description

0 10 silt, moderately clayey, in part very clayey, sligthly micaceous, light gray; iron stain

10 15 as above, pale brown

15 20 as above, much iron stain

20 26 as above, yellow

26 30 Soil: silty, very clayey, dark gray; contains carbonaceous material

30 40 silty, slightly clayey, slightly micaceous, light gray; iron stains

40 45 as above, slightly darker

45 50 as above, moderately clayey, light brownish-gray

50 60 as above, trace of pale brown

60 65 as above, in part clay

65 75 Clay, silty, very slightly sandy, light gray; sand is very fine'; trace of iron stain

75 80 as above, trace of limy areas

80 85 as above, no trace of limy areas

85 95 till: clay, silty, sandy, moderately calcareous, yellow-brown; contains limy grains

95 100 as above, light gray to yellow brown

100 105 as above, yellow brown

105 170 as above, slightly gravelly

170 200 Sand, gravelly, silty; fine sand to fine gravel (15-35% gravel)

200 208 Till: clay, silty, sandy, moderately calcareous, pale yellow

208 225 Till: clay, silty, sandy, moderately clacareous, blue-gray

225 230 as above, trace gravel

230 245 as above, no gravel

245 265 as above, some medium gravel

265 285 as above, some medium gray

285 295 Dakota: sand, silty, very fine to coarse, some iron stain

1

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Appendix C: Additional information used in cross section from Thurston County to Pawnee County (CCS-18.3)

log ID: 3 legal location: 16N-10E-5

elevation: 1143 ft longitude: -96.32561 latitude: 41.379094

depth (ft)

from to description

0 15 fill: clay and silt

15 18 sand, contains silt and clay, blue

18 21.5 clay, contains silt and sand, black

21.5 31.5 sand, very fine to coarse; contains some gravel; clean, fairly compact tan and blue-gray

31.5 37 sand and gravel, grades from fine sand to coarse gravel, ~75% sand; clean, fairly compact

37 54.5 Till: clay, sand, silt, and gravel. Tan, grey, brown

54.5 60 Till: clay, sand silt and gravel. Contians layer of sand and gravel, very compact, tan grey

and brown

log ID: 4 legal location: 15N-10E-18

elevation: 1125 ft longitude: -96.335283 latitude: 41.268053

depth (ft)

from to description

0 10 top soil

10 70 gravel, some fine sand

70 73 gray clay

73 80 gravel

80 90 brown gravel

90 100 red shale

100 150 red and gray shale

150 180 sandstone

180 190 limestone, hard

log ID: 5 legal location: 15N-10E-29

elevation: 1110 ft longitude: -96.327742 latitude: 41.242794

depth (ft)

from to description

0 4 fine sand

4 13.5 coarse sand

13.5 18 fine gravel

18 27 fine sand

27 39 gravel, 1.25"

39 73 fine sand

73 92.5 coarser

92.5 100 coarser dand

2

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Appendix C: Additional information used in cross section from Thurston County to Pawnee County (CCS-18.3)

log ID: 6 legal location: 14N-10E-5

elevation: 1107 ft longitude: -96.325949 latitude: 41.208348

depth (ft)

from to description

0 5 Road fill: silt, organic, black-yellow brown

5 12 clayey silt, dark gray to yellow brown, some road fill

12 30 fine to coarse sand, <15% small gravel, well rounded, clean, granitic

30 64 as above, granitic and feldspar

64 70 low plasticity clay, dark gray, sandy

70 80 fine to coarse sand, fine to coarse gravel, <10% cobbles, granitic, feldspar, mafic, well

rounded

80 90 medium to coarse sand, iron stained, well rounded, granitic, feldspar, marfics

90 99 as above, fine to medium gravel (<10%)

99 100 fine silica sand, well sorted. Dakota

log ID: 8 legal location: 11N-9E-25

elevation: 1320 ft longitude: -96.356826 latitude: 40.886013

depth (ft)

from to description

0 4 top soil

4 10 brown clay

10 18 yellow clay

18 29 tan clay

29 56 yellow clay

56 69 brown clay

69 80 50% fine sand

80 116 blue clay

116 117 blue Shale

117 148 blue clay

148 151 gravel

151 170 blue clay

170 174 rock

174 195 Shale and limestone layers

195 210 blue shale

log ID: 9 legal location: 10N-10E-7

elevation: 1315 ft longitude: -96.348681 latitude: 40.848942

depth (ft)

from to description

0 32 clay

32 37 clay, silty to moderately sandy, medium brown, in part very sandy

37 52 sand, fine to medium, a little coarse sand

52 87 sand, fine to coarse, trace very coarse sand, much medium to coarse sand

87 91 silty, clay, very light gray. Possibly top of Dakota

91 110 sand to sandstone, medium to coarse, highly iron stained

110 148 as above, very fine to medium, principally white

3

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Appendix C: Additional information used in cross section from Thurston County to Pawnee County (CCS-18.3)

log ID: 10 legal location: 10N-9E-24

elevation: 1320 ft longitude: -96.360742 latitude: 40.827178

depth (ft)

from to description

0 1.5 black soil

1.5 17 brown clay

17 35 sticky red clay

35 64 hard gray and yellow clay with boulders

64 69 yellow clay, trace of fine sand

69 84 hard yellow sandy clay and boulders

84 86 fine and coarse buff sand

86 89 yellow sandy clay

89 92 fine and coarse buff sand

92 95 yellow sandy clay

log ID: 11 legal location: 10N-10E-30

elevation: 1345 ft longitude: -96.350272 latitude: 40.812563

depth (ft)

from to description

0 2 top soil

2 18 yellow clay

18 85 clay, sandy

85 90 sand, fine, packed and silty

90 100 medium coarse sand, cemented, traces of clay or shale which may be the material which

cements the sand

100 165 clay, sandy with little gravel in some parts

165 166 limestone

log ID: 12 legal location: 9N-9E-13

elevation: 1130 ft longitude: -96.352257 latitude: 40.740569

depth (ft)

from to description

0 3.5 road fill; silty clay, black, wet, medium plasticity, medium stiff

7.5 9 as above, with lime concretions

9 10 silty clay, dark gray mottled with yellow brown, wet, high plasticity, very stiff

10 12 silty clay; grayish brown, wet, medium plsticity, stiff

12 16.5 silty clay; grayish brown, mottled with yellowish brown, saturated, medium plasticity, stiff

16.5 18.5 silty clay; grayish brown, mixed with brown, saturated, medium plasticity, medium stiff

18.5 20 silty clay; grayish brown, saturated, medium plasticity, medium stiff

20 23 as above

23 25 sitly clay; grayish brown, mottled with yellowish brown, saturated, medium plasticity,

medium stiff

25 36 silty clay; grayish brown, mottled with gray and black, saturated, medium plasticity, stiff to

very stiff

36 39.5 silty caly; gray mottled with yellow brown, saturated, medium plasticity, very stiff

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Appendix C: Additional information used in cross section from Thurston County to Pawnee County (CCS-18.3)

39.5 40 sandy clay; gray, saturated, medium plasticity, very stiff, 25% sand

40 43 as above

43 44.5 sandy clay; gray, saturated, medium plasticity, stiff to very stiff (25% sand)

44.5 46 clayey shale

46 46.5 shale and limestone

46.5 47 limestone (clayey)

47 49 limestone-shale transitity

49 52.5 limestone (clayey)

log ID: 13 legal location: 8N-9E-36

elevation: 1290 ft longitude: -96.349992 latitude: 40.616757

depth (ft)

from to description

0 1.5 blck top soil

1.5 8 yellow clay

8 12 medium sand, buff color

12 15 medium to coarse gravel, multi color

15 24 soft brown clay with gravel streaks

24 32 medium to fine gravel

32 44 yellow sandy clay with gravel streaks

44 90 blue clay

90 92 sandstone

92 107 blue clay

107 112 medium to coarse gravel

112 119 blue clay

119 120 limestone

log ID: 14 legal location: 7N-10E-19

elevation: 1152 ft longitude: -96.336251 latitude: 40.555596

depth (ft)

from to description

0 20 Clay

20 25 Sand, medium coarse, some very fine to very coarse

25 30 sand and gravel, 20% gravel

30 35 clayey silt, sandy, medium dark gray

35 40 Sandy gravel, 60% gravel

40 45 Sand, slightly gravelly

45 46 Rock, some limestone cuttings in last sample

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Appendix C: Additional information used in cross section from Thurston County to Pawnee County (CCS-18.3)

Published measured sections used to correlate bedrock

Log ID: 7 source: Burchett, R.R., 1971. Guidebook to the geology along portions of the lower

Platte River Valley and Weeping Water Valley of Eastern Nebraska. Conservation

and Survey Division, University of Nebraska-Lincoln, 39 p.

Oil and gas wells used to correlate bedrock (more information at http://nogcc.ne.gov/)

log ID API number

Erickson-1 26021000020000

Marshall-1 26177190000000

Smith-1 26055190010000

Sorenson-1 26055210010000

Darst-24 26155300100000

Zimmerman-21 26155300050000

Thomas-23 26155300060000

Sunflower-1 26131300000000

Bartels-1 26097300030000

Schuster-1 26133000030000

Loch-1 26133000100000

6