!(!(!(!(

!.

!.

!.

!.

!.

!

!

1630 1600

1600

1550

1550 1550

1570

1550 1550

1550

1600

1600

1600

1600

1600

1620

1610

1600

1600

1600

1620

1620

1600

1600

1600

1600

1550

1560

1600

1570

1600

1600

1630

1600

1570

1560

1560

1570

1580

1600

1650

1640

1630

1650

1640

1620

1600

1600 1620

1630

1620

1610

1620

1610

1600

16101620

1600

1610

1640

1600

1630

1630

1650

1650

1600

1620

1600

1570

1560

1600

1600

1570

1600 1600

1580

1600

1650

1650

1650

1640

1650

1640

1640

1650

16001630

1610

1600

1600

1600

1600

1610

1600

1600

1610

16101600

1650

1600

1620

1630

1650

1640

1650

1650

1650

1650

1650

1650

1660

1650

1660

1650

1650

16401640

1630

1630

1630

1620

1610

1610

1610

1640

1610

1600

1600

1620

1610

1630

1620

1600

1620

1630

1640

1630

1640

1640

1650

1650

1650

1650

1650

1650

1650

1650

1650

1650

1640

1640

1630 1630

1620

1620

1620

1620

1610

1610

1610

1610

14 13 18 17 16 1514 13

23 24 19 20 21 22 23 24

2526272829302526

35 36 31 32 33 34 35 36

2

11

3

10

4

9

5

8

6

7

1

12

2

11

14 13 18

23 24 19

17

20

16

21

15

22

14 13

2423

25

36

26

35

27

34

2829302526

R 3 W R 2 W

T 9 N

T 8 N

R 2 WR 3 W

T 9 NT 8 N

£¤81

£¤81

£¤81

£¤6

£¤6

£¤6

M c Cool Junc tion

Fairm ont

Y ORK COFILLM ORE CO FILLM ORE CO

Y ORK CO

West

Fork

Big

Blue

River

Galaway

Creek

Sininger Lago

on

County L

ine Mars

h

Indian

Creek

Creek

Indian

60-B-49

61-B-49

62-B-49

39-U-41

11-EXT-1710-EXT-17 08-EXT-17

09-EXT-17

30-B-45

07-EXT-17

06-EXT-17

4500

4501

4502

4503

4504

4505

4506

4507

4508

4509

4510

4499

45 11 000mN

4500

4501

4502

4503

4504

4505

4506

4507

4508

4509

4510

4511

44 99 000mN

4512

618 619 620 621 622 623 624 625617 6 26 000mE

618 619 620 621 622 623 624 6256 17 000mE 0626

40'

42'30"

40'

42'30"

35' 32'30"

35' 32'30"97°37'30"

97°37'30"40°45' 40°45'

97°30'

97°30'40°37'30"40°37'30"

Qb

Qb

Qb

Qb

Qb

QbQb

Qb

Qb

Qb

Qb

Qb

Qr

Qr

Qr

Qr

Qr

Qr

Qb

Qb

Qp/Qal

Qb

W

Qp

F

F

F

F

Ql

Qp

Qp

Qp

Qal

Qal

Qal

Qp/Qal

Qp/Qal

Qp/Qal

Qp

Qsw

Qp/Qal

Ql

Ql

Ql

Qsw

QalQp

Qsw

Qsw

Qsw

Qal

Qal

Qal

Qp

Qp

Qsw

Qsw

QlP

Qsw

Qal

Ql

Qal

Qal

Qal

Qp/Qal

Qp/Qal

Qp/Qal

P

W

Qsw

Qal

Qal

Qal

Ql

Ql

Qsw

Qsw

Qb

Qp

Qp

Qsw

Qp

Qsw

Qal

Qal

Qal

Qal

Qp

Qsw

Utica SWYorkSouthYork SW

ExeterFairmontGrafton

Friend SWGenevaGenevaSW

NEBRASKA

MAP LOCATION

1 0 10.5 Miles

1 0 10.5 Kilometers

1,000 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 Feet

SCALE 1:24000

CONTOUR INTERVAL 10 FEETNATIONAL GEODETIC VERTICAL DATUM OF 1929

This geologic map was funded in part by the USGS National Cooperative Geologic Mapping Program underStateMap award number G16AC00298, 2016. The views and conclusions contained in this document are thoseof the authors and should not be interpreted as necessarily representing the official policies, either expressed orimplied, of the U.S. Government.Projection: Universal Transverse Mercator, zone 14 North, NAD83.

1,000-meter Universal Transverse Mercator grid ticks shown in blue. Contours from the Nebraska Department of Natural Resources, Compiled from USGS 7.5 minute topographic quadrangles. Additional base data derived from the 2010 TIGER line files. APPROXIMATE MEAN

DECLINATION, 2017

Description of Mapping Units

Recent alluvial deposits and active river channels Late st Holoc e ne Silt and silty clay Alluvial d e posits in valle ys assoc iate d with tributarie s of the W e st Fork of the Big Blue River. Ge nerally, the s e d e posits are re lative ly thin, and are usually le s s than 4 m e ters (~ 13 fe e t) in total thic kne s s. Alluvial se d im e nts prim arily c onsist of reworke d loe s s.

Qal

Slope wash Silt to silty clay Holoc e ne to re c e nt Se d im e nts ac cumulate d at the base of slope s, usually along the m argins of stream valle ys. Ge nerally, slope wash is sourc e d from nearby Pe oria Loe s s (Qp). In m ost areas mappe d, slope wash has be e n e nhanc e d by agricultural prac tic e s whic h cause d increase d erosion rate s over the past c e ntury. Total se d im e nt ac cumulation is usually le s s than 3 m e ters (~ 10 fe e t).

Qsw

Peoria Loess Late Ple istoc e ne Silt to silty clay Late Ple istoc e ne age d loe s s. Loe s s is a wind-blown silt and c lay d e posit that locally c ontains very fine and fine sand. Pe oria Loe s s in the re gion ge nerally range s from 4 to 8 m e ters (13 to 26 fe e t) in total thic kne s s. Pe oria Loe s s was like ly d e posite d be twe e n ~ 25,000 and 14,000 years ago (Be ttis e t al., 2003; M ason e t al., 2011). This unit is sporad ically und erlain by the Gilm an Canyon Form ation, a dark brown or blac k c olore d silty loe s s unit that is ~1 m e ter (3 fe e t) in thic kne s s, and is usually und erlain by the Love land Loe s s (Ql).

Qp

Peoria Loess overlying alluvium Late Ple istoc e ne Silt to silty clay overlying sand and gravel Pe oria loe s s (Qp) overlying low re lief alluvial d e posits in local stream valle ys. Pe oria loe s s overlie s alluvium that inc lud e s silt, c lay and sand and grave l. The alluvium is approxim ate ly 6 m (18 fe e t) thic k. Till and assoc iate d glac ial se d im e nts und erlie the sand and grave l.

Qp/Qal

Loveland Loess M id d le Ple istoc e ne Silty clay to clayey silt. M id d le Ple istoc e ne age d loe s s. Love land Loe s s is old er than both the overlying Pe oria and Gilm an Canyon Formation loe s s d e posits. Love land Loe s s can be d istinguishe d from Pe oria Loe s s by its c harac teristic re d or pink c olor and finer (c lay-ric h) texture. Areas mappe d as Ql are ge nerally found on valle y sid e slope s where stream inc ision has expose d the Love land Loe s s. De posits are ge nerally le s s than 3 m e ters (~ 10 fe e t) in total thic kne s s.

Ql

Rainwater Basin deposits M id d le Ple istoc e ne to Holoc e ne Reduced silt and silty clay with sand beds and occasional organic matter Silty and sand y se d im e nts that ac cumulate d in c los e d d e pre s sions that are locally referre d to as ‘rainwater basins’. Basins are e lliptical d e pre s sions with long axe s that are typically orie nte d southwe st to northeast. The d e pre s sions c om m only have a linear rid ge (Qr) on the ir southeastern e d ge. Basin fills are typically 4-8 m thic k in the m appe d area. The d e pre s sions c om m only c ontain we tland s, and seasonal lake s. Basins are im m e d iate ly und erlain by loe s s and re-worke d loe s s as we ll as be d d e d sand s that fre que ntly c ontain organic ric h d e posits and burie d soils. The s e se d im e nts are in turn und erlain by pink sand and grave ls whic h are interpre te d as alluvium d e posite d by the Platte River >200,000 yrs ago (Swine hart e t al., 1994).

Qb

Rainwater Basin Rim M id d le to late Ple istoc e ne Silt to silty clay overlying sand and sand and gravel Pe oria loe s s (Qp) overlying old er e olian and alluvial d e posits. Rim s are c om m on on m any, but not all, of the southeastern e d ge s of rainwater basins throughout the area. Rim s range from approxim ate ly 5-7 m e ters (15-21 fe e t) above the surround ing land s c ape. Stratigraphy of the rim s varie s, but ofte n inc lud e s Pe oria Loe s s overlying Gilm an Canyon Formation loe s s followe d by m e d ium sand, and sand and grave l. The rim like ly form e d as wind erosion sc oure d the rainwater basin. W ithin the m apping area basins were like ly form e d prior to the d e position of both the Pe oria and Gilm an Canyon loe s s.

Qr

Artificial fill

F

Pit (active and abandoned soil borrow pit)

P

! M ud rotary te st hole s

!. Historic te st hole drille d by the CSD drilling program (the last two d igits ind icate year drille d)

!( Se d im e nt c ore

M ap unit c ontac t, approxim ate

W e ste rn glac ial boundary

Water

W

Surficial Geology of the Fairmont 7.5 Minute Quadrangle, Nebraska

P. R. Hanson1, A. R. Young1, A. K. Larsen1, L. M. Howard1, and J. S. Dillon2 1Cons ervation and Surve y Division (Nebraska Ge ological Surve y) Sc hool of Natural Re sourc e s, University of Nebraska – Linc oln

2De partm e nt of Ge ography and Earth Sc ie nc e, University of Nebraska – Kearne y Version 1.0, September 2017

HoloceneLate

Pleistocene

Quaternary

EolianSediments

BasinDeposits

Qb Qr

Qp

Alluvial Deposits

Qp/Qal

Qal

Slope Washand

Colluvium

Qsw

Ql