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KANS AS Q UADR ANGLE LOCAT I ON A R K A N S A S RIVER A R KA NS A S R I V E R C o w s k i n C r e e k C o w s k i n C r e e k C o w s k i n Creek C o w s k i n C r e e k C o w s k i n Creek Big S lo ugh R 2 W R 3 W T 26 S T 25 S T 25 S T 26 S R 2 W R 3 W Roberts Field Airport Eagle Field Airport KANSAS & OKL AHO MA RAILR OAD KA NSAS & OK LA HOM A RA I L ROAD KANSAS & OKLAHOMA RAILROAD A F 96 A F 96 A F 96 Col w i c h 23 14 15 16 18 17 13 14 23 22 21 24 19 20 27 28 30 29 25 26 35 34 33 32 31 36 35 2 3 4 5 6 1 2 11 10 9 8 7 12 11 14 15 16 17 18 13 14 23 22 21 20 19 24 23 26 27 28 29 30 25 26 35 34 26 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1450 1450 1450 1450 1450 1450 1450 1400 1400 1400 1350 1350 97º37'30" 97º30' 37º45' 97º37'30" 37º45' 97º30' 37°52'30" 37°52'30" Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qas Qas Qas Qt Qt Qt Qt Qt Qt Qt Qt Qt Qt Qt Qt Qt Qt Qt Qt Qt Qt Qt Qt Qt Qt Qt Qt Qt Qt Qt Qt Ql Ql Ql Ql Ql Ql Ql Ql Ql Ql Ql Ql Ql Qas Qas Qas Qas Qt Qt Qt Qt Qt Qt Qt Qt Qt Qt Qt Qt PRELI MI NARYSURFI CI AL GEOLOGYOF THE COLWI CH QUADRANGLE , SEDGWI CK COUNTY , KANSAS Ge ol ogy by Wi l l i am C . Pa rc e l l , Ga re t L . Di nke l , and Me ghan D . Curti s Co m put er co m pil at io n an d car t o gr aphy by Jo hn W. Dun ham an d S ar ah F . Chil d 2 016 Fund e d i n pa rt by th e USGS Na ti ona l Coope ra ti v e Ge ol og i c Ma pp i ng Prog ra m Op e n- F i l e Re port 20 16 - 17 APPROXIMATE MEAN DECLINATION, 2016 & 3°54' TRUE NORTH MAGNETIC NORTH & 1 13 20 27 16 11 19 8 15 25 23 14 3 21 17 28 5 18 12 6 26 22 9 4 24 7 2 10 SEDGWICK COUNTY QUADRANGLES 1 Patterson 2 Bentley 3 Sedgwick 4 Sedgwick NE 5 Whitewater 6 Mount Hope 7 Colwich 8 Maize 9 Valley Center 10 Greenwich 11 Cheney 12 Garden Plain 13 Goddard 14 Wichita West 15 Wichita East 16 Andover 17 Cheney SE 18 Lake Afton 19 Clearwater 20 Bayneville 21 Derby 22 Rose Hill 23 Norwich 24 Conway Springs 25 Millerton 26 Zyba 27 Belle Plaine 28 Mulvane E l evat ion con t ours are presen t ed fo r gen eral referen ce. Used in t he U . S. Geo l ogical Survey s curen t US Topo 1 : 2 4 , 0 - scal e t opographic m ap ser ies , t hey were gen erat ed from hy drographical l y- im proved 1 / 3 arc- secon d Nat ion al E l evat ion Dat aset ( NED) dat a, an d smo t hed dur ing pro ces ing fo r use at 1 : 24 , 0 scal e. I n some pl aces t he con t ours m ay be mo r e gen eral ized t han t he base dat a used fo r compil at ion o f geo l ogic out crop pat ern s . Out crop pat ern s on t he m ap wil l t y pical l y refl ect t opographic var iat ion mo re accurat el y t han t he aso ciat ed con t our l in es . R epeat ed fl uct uat ion o f an out crop l in e acro s a con t our l in e shoul d be in t erpret ed as an in dicat ion t hat t he mapped ro ck un it is m ain t ain ing a rel at ivel y con s t an t el evat ion al ong a gen eral ized con t our . USGS Nat ion al E l evat ion Dat aset 1 / 3 - arc- secon d 15 x 15 m in ut e hil l shade gr ids an d 1 - m 209 U . S. Depar t m en t o f Agr icul t ure F arm Services Agen cy ( US DAFS A) Nat ion al Agr icul t ure I magery P rogram ( NAI P ) digit al imagery were used as referen ces in t he digit al m apping. USGS 7 . 5 - m in 1 : 24 , 0 - scal e t opographic m aps , US DANat ural Resources Con servat ion Service ( NR CS) W eb So il Survey Geographic Dat abase ( S SUR GO) , an d o t her geo l ogic m aps an d bul l et in s were used t o suppl em en t t he m apping. Ro ads an d highways are shown on t he base m ap as represen t ed by dat a from t he Kan sas Depar t m en t o f T ran spo r t at ion ( KDOT ) , U . S. Cen sus Bureau, an d o t her sources . U . S. Depar t m en t o f Agr icul t ure F arm Services Agen cy ( US DAFS A) Nat ion al Agr icul t ure I magery P rogram ( NAI P ) imagery al so was used t o check ro ad l o cat ion s . S haded rel ief is based on 1 - m et er hy dro fl at en ed bare- ear t h DEMs from t he C it y o f W ichit a- S edgwick Coun t y L iDAR pro ject . The o r igin al 1 - m et er DEM im ages , in ERDAS I MAGI NE fo rmat , St at e P l an e Kan sas- Sout h pro ject ion , No r t h Amer ican Dat um o f 1983 ( NAD 83 ) , were resam pl ed t o 3 - m et er reso l ut ion , mo saicked in t o a s ingl e out put DEM, which was repro ject ed t o Un iversal T ran sverse Mercat o r ( UTM) Zon e 14 . The out put DEM was t hen conver t ed t o a hil l shade, a m ul t idirect ion al shaded- rel ief im age us in g an gl es o f il l um in at ion from 0 °, 25 °, 270 °, an d 315 ° azim ut hs , each 45 ° above t he ho r izon , wit h a 4x ver t ical ex aggerat ion . This geo l ogic m ap was funded in par t by t he US GSNat ion al Coperat ive Geo l ogic Mapping P rogram , award n um ber G15AC0258 ( FY 20 15 ) . This m ap was produced us in g t he ArcGI S sys t em devel oped by Es r i ( En vironmen t al Sys t em s Research I n s t it ut e, I n c. ) . This m ap is a prel im in ary product an d has had l es scien t ific an d car t ographic review t han t he Kan sas Geo l ogical Survey s M- ser ies geo l ogic m aps . KGS do es n o t guaran t ee t his m ap t o be free from ero rs o r in accuracies an d discl aim s any respon s ibil it y o r l iabil it y fo r in t erpret at ion s m ade from t he m ap o r decis io n s based t hereon . SUGGESTED REFERENCE TO THE MAP Parcel l , W. C . , Din kel , G . L . , an d Cur t is , M. D . , 2016 , P r el im in ary surficial geo l ogy o f t he Co l wich quadran gl e, S edgwick Coun t y, Kan sas : Kan sas Geo l ogical S urvey, Open - F il e R epo r t 20 16 - 17 , scal e 1 : 2 4 , 0 , un publ ished. EXPLANATI ON Tra nsporta ti on Lo cal r o ad Airpo r t runway R ail ro ad St at e highway A F 96 Bo unda ri e s and Loc a ti ons S ect io n l in e Town ship/ ran ge l in e Ge ol og i c Uni t Bo unda ri e s Observed co n t act Hydrol ogy and Topog raphy Peren ial s t r eam I n t ermit en t s t ream W at er body E l evat ion co n t our ( 1 0 - fo t in t erval ) Depr es io n co n t o ur ( 1 0 - fo t in t er val ) E l evat ion co n t our ( 5 0 - fo t in t erval ) 1400 Depres ion con t o ur ( 5 0 - fo t in t erval ) 1400 W at er body ( manmade sho rel in e) UNI VERSAL TR ANSV ER SE MER CATOR PR OJECT I ON, Z ONE 14 NOR TH AMERI CAN DATUM OF 1 983 S CALE 1 : 24 0 1 0 1 0.5 MILES 1000 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 500 FEET 1 0 1 2 0.5 KILOMETERS 1000 0 1000 2000 500 METERS Ql Qal Qas Qt GEOLOGI C UNI TS CENOZOI C Qua te rn a ry Syste m P l e i sto c e ne Ho l oc e ne Ac ti v e sand Act ive san d depo s it s are rewo rked sedim en t s der ived from al l uvium , l o es an d Pal eo zo ic un it s . The sedim en t s are foun d al on g l on g, gen t l e s l opes an d in s t ream beds erodin g l o es , al l uvium an d Pal eo zo ic un it s ( Lan e an d Mil l er , 1965 ) . The un it is represen t ed by fin e t o co arse quar t z san d an d fin e t o co arse arko s ic san d con t ain in g m in o r amoun t s o f s il t an d cl ay ( Al ber t an d St ramel , 196 ) , as wel l as weat hered an d eroded Pal eo zo ic s il t , shal e, an d carbon at es . Thickn es o f t he un it ranges up t o 30 feet ( Lan e an d Mil l er , 1965 ) . Al l uv i um Al l uvium in S edgwick Coun t y is fin e t o co arse san d an d fin e t o co arse arko s ic gravel con t ain ing m in o r amoun t s o f s il t an d cl ay t hat grades upward in t o cl ay ey s il t . A l l uvium from t he Arkan sas R iver is compo sed o f un con so l idat ed gravel , san d, an d s il t an d has an es t im at ed t hickn es o f 75 feet ( W il l iam s an d Lohman , 1949 ) . P l eis t o cen e- age al l uvium is presen t t o a dept h o f n ear l y 50 feet an d P l eis t o cen e t o po s ibl y P l io cen e t o a dept h o f over 180 feet t o t al dept h ( Lan e an d Mil l er , 19 65 ) . A l l uvium o f Q uat ern ary age l in es t he fl odpl ain o f t he L it l e Arkan sas R iver wit h l im it ed ex t en s ion up smal l er creeks . I n cer t ain areas al l uviumm ay fo rml ow t eraces o f 10 - 20 feet above t he fl odpl ain ( Aber , 191 ) . A l l uvium foun d in smal l er creeks is compo sed o f fin er sedim en t s an d is var iabl e in l it ho l ogy ( Mo re, J ewet , an d OCon o r , 195 1 ) . I t s source is t he shal es an d carbon at es in t he Permian W el l ingt on Fo rmat ion an d P l eis t o cen e l o es . Loe ss W in d- bl own l o es depo s it s in S edgwick Coun t y are t an t o pin k- t an cal careous s il t wit h zon es o f cal iche an d fin e san d ( Bevan s , 1989 ) . The l o es ran ges from P l eis t o cen e t o Ho l o cen e in age. Lo es covers many o f t he upl an d surfaces in S edgwick Coun t y ( W el ch an d Hal e, 1987 ) an d res t s un con fo rmabl y on t he Permian W el l in gt on Fo rmat ion an d s t rat igraphical l y bel ow t hick ( >5 ft ) so il s . Te rra c e s Teraces con s is t o f un con so l idat ed sedim en t s in t he Arkan sas R iver fl odpl ain ( Lan e, 198 ) . Ter aces are predom in at el y gravel , san d, cl ay , an d s il t varying in t hickn es an d o ccas ion al l y con t ain cl ay an d s il t l en ses ( Bayn e an d OCon o r 1968 ) . Teraces were subdivided by Bayn e ( 1962 ) as represen t in g depo s it ion in t he I l l in o isan St age ( approxim at el y equival en t t o m ar in e iso t ope s t age [MI S] 6 ) an d t he Wiscon s in an St age ( MI S 2 t o 5 ) . The o l der I l l in o isan St age ( MI S 6 ) t erace depo s it s are pr im ar il y s il t an d sandy s il t ( Bayn e an d OCon o r , 1968 ) . S an d an d gravel beds are al so kn own t o l o cal l y con t ain cl ay an d s il t l en ses ( Bayn e an d OCon o r , 1968 ) . Lo es - der ived s il t s , l argel y y el l owish t o reddish- brown in co l o r , are foun d in t he upper po r t ion o f t hese t erace depo s it s . These l o es - der ived depo s it s are approxim at el y 40 feet t hick in S edgwick Coun t y. ( Lan e an d Mil l er , 1965 ) . Lat er rejuven at ion o f t he Arkan sas R iver dur in g t he Wiscon s in an St age ( MI S 2 - 5 ) caused t he r iver s in cis ion in t o ear l ier t erace depo s it s . This pro ces depo s it ed arko s ic san d an d gravel an d subsequen t l y s il t an d cl ay depo s it s ( Bayn e, 1962 ) . I n sout h- cen t ral Kan sas , t his un it is der ived from Pal eo zo ic an d Meso zo ic depo s it s an d can reach 5 feet in t hickn es ( Bayn e, 1962 ) . CI TED REFERENCES A l ber t , C . D . , an d St ramel , G . J. , 1 96 , F l uvial sedim en t in t he L it l e Arkan sas R iver Bas in , Kan sas : U . S. Geo l ogical S urvey, W at er- S uppl y Paper 17 98 - B , 30 p. Aber , J. S. , 191 , S urficial geo l ogy o f But l er Coun t y, Kan sas , fin al repo r t : Kan sas Geo l ogical S urvey, Open - F il e R epo r t 91 - 48 , 31 p. Bayn e, C . K . , 1962 , Geo l ogy an d groun d- wat er resources o f Cowl ey Coun t y, Kan sas : Kan sas Geo l ogical S urvey, Bul l et in 158 , 219 p. Bayn e, C . K . an d O ' Con o r , H . G . , 19 68 , Q uat ern ary Sys t em , p. 59 - 67 ; in Z el l er , D . E . , ( ed. ) ; The s t rat igraphic succes ion in Kan sas : Kan sas Geo l ogical S urvey, Bul l et in 189 , 8 1 p. Bevan s , H . E . , 1989 , W at er r esources o f S edgwick Coun t y, Kan sas : U . S. Geo l ogical S urvey, W at er Resources I n ves t igat ion s R epo r t 8 - 425 , 19 p. Lan e, C . W. , an d Mil l er , D . E . , 1 965 , Geohy dro l ogy o f S edgwick Coun t y, Kan sas : Kan sas Geo l ogical S urvey, Bul l et in 176 , 10 p. Mo re, R. C . , J ewet , J. M. , an d OCon o r , H . G . , 195 1 , Geo l ogy, m in eral resources , an d groun d- wat er r esources o f Chase Coun t y, Kan sas , par t 1 Ro ck fo rmat ion s o f Chase Coun t y: Kan sas Geo l ogical S urvey, Vo l um e 1 , p 1 - 16 . ht p: / / www. kgs . ku. edu/ Gen eral / Geo l ogy/ Chase/ . W el ch, J. E . , an d Hal e, J. M. , 19 87 , P l eis t o cen e l o es in Kan sas s t at us , presen t probl em s , an d fut ure con s iderat ion s ; in Q uat ern ary En vironmen t s o f Kan sas , W. C . John son , ed. , Kan sas Geo l ogical S urvey, Guidebok S er ies 5 , p. 67 - 84 . W il l iam s , C . C . , an d Lohman , S. W. , 1949 , Geo l ogy an d groun d- wat er resources o f a par t o f sout h- cen t ral Kan sas , wit h special referen ces t o t he W ichit a m un icipal wat er suppl y, wit h an al yses by Rober t H . Hes an d o t hers : Kan sas Geo l ogical S urvey, Bul l et in 79 , 45 p.

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KANSAS

Q UADR ANGLE LOCATION

A R K A N S A S

R I V E R

A R K A N S A S

R I V E R

Cowskin

Creek

Cows

kinCr

eek

Cowskin

Creek

Cowskin

Creek

Cowsk

in

Creek

Big Slough

R 2 WR 3 W

T 26 S

T 25 ST 25 S

T 26 S

R 2 WR 3 W

Roberts Field Airport

Eagle FieldAirport

KANSAS & OKLAHOMA RAILROAD KANSAS &OKLAHOMA

RAILROADKANSAS & OKLAHOMA RAILROAD

AF96

AF96

AF96

Colwich

23

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23222124 19 20

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97º37'30" 97º30'

37º45'97º37'30"

37º45'97º30'

37°52'30"37°52'30"

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PRELIMINARY SURFICIAL GEOLOGY OF THECOLWICH QUADRANGLE, SEDGWICK COUNTY , KANSAS

Geo lo gy by William C. Parcell, Garet L. Dinkel, and Meghan D. CurtisCom puter compilation and cartography by John W . Dunham and S arah F. Child

2016Funded in part by the

USGS Natio n al Co o perative Geo lo gic Mapping Pro gram

Open-File Repo rt 2016-17

APPROXIMATE MEANDECLINATION, 2016

&

3°54'

TRUE

NOR

THMA

GNET

IC N

ORTH

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SEDGWICK COUNTY QUADRANGLES 1 Patterson 2 Bentley 3 Sedgwick 4 Sedgwick NE 5 Whitewater 6 Mount Hope 7 Colwich 8 Maize 9 Valley Center 10 Greenwich 11 Cheney 12 Garden Plain 13 Goddard 14 Wichita West

15 Wichita East 16 Andover 17 Cheney SE 18 Lake Afton 19 Clearwater 20 Bayneville 21 Derby 22 Rose Hill 23 Norwich 24 Conway Springs 25 Millerton 26 Zyba 27 Belle Plaine 28 Mulvane

Elevation contours are presented for general reference. Used in the U.S. Geological S urvey’s current US Topo 1:24,000-scale topographic m ap series, they were generated from hydrographically-im proved 1/3 arc-second National Elevation Dataset (NED) data, and smoothed during processing for use at 1:24,000 scale. In som e places the contours m ay be more generalized than the base data used for compilation of geologic outcrop patterns. Outcrop patterns on the m ap will typically reflect topographic variation more accurately than the associated contour lines. R epeated fluctuation of an outcrop line across a contour line should be interpreted as an indication that the m apped rock unit is m aintaining a relatively constant elevation along a generalized contour. USGS National Elevation Dataset 1/3-arc-second 15 x 15 m inute hillshade grids and 1-m 2009 U.S. Departm ent of Agriculture–Farm S ervices Agency (USDA–FSA) National Agriculture Im agery Program (NAIP) digital im agery were used as references in the digital m apping. USGS 7.5-m in 1:24,000-scale topographic m aps, USDA–Natural R esources Conservation S ervice (NR CS) W eb Soil S urvey Geographic Database (S S UR GO), and other geologic m aps and bulletins were used to supplem ent the m apping. R oads and highways are shown on the base m ap as represented by data from the Kansas Departm ent of Transportation (KDOT), U.S. Census Bureau, and other sources. U.S. Departm ent of Agriculture–Farm S ervices Agency (USDA–FSA) National Agriculture Im agery Program (NAIP) im agery also was used to check road locations. S haded relief is based on 1-m eter hydroflattened bare-earth DEMs from the City of W ichita-S edgwick County LiDAR project. The original 1-m eter DEM im ages, in ER DAS IMAGINE form at, S tate Plane Kansas-South projection, North Am erican Datum of 1983 (NAD 83), were resam pled to 3-m eter resolution, mosaicked into a single output DEM, which was reprojected to Universal Transverse Mercator (UTM) Z one 14. The output DEM was then converted to a hillshade, a m ultidirectional shaded-relief im age using angles of illum ination from 0°, 225°, 270°, and 315° azim uths, each 45° above the horizon, with a 4x vertical ex aggeration. This geologic m ap was funded in part by the USGS National Cooperative Geologic Mapping Program, award num ber G15AC002258 (FY 2015). This m ap was produced using the ArcGIS system developed by Esri (Environm ental S ystem s R esearch Institute, Inc.). This m ap is a prelim inary product and has had less scientific and cartographic review than the Kansas Geological S urvey’s M-series geologic m aps. KGS does not guarantee this m ap to be free from errors or inaccuracies and disclaim s any responsibility or liability for interpretations m ade from the m ap or decisions based thereon. SUGGESTED REFERENCE TO THE MAP Parcell, W . C., Dinkel, G. L., and Curtis, M. D., 2016, Prelim inary surficial geology of the Colwich quadrangle, S edgwick County, Kansas: Kansas Geological S urvey, Open-File R eport 2016-17, scale 1:24,000, unpublished.

EXPLANATION

Tran spo rtatio n

Local road

Airport runwayR ailroad

S tate highwayAF96

Bo undaries and Lo catio n s

S ection lineTownship/range line

Geo lo gic Unit Bo undariesObserved contact

Hydro lo gy and To po graphyPerennial streamInterm ittent streamW ater body

Elevation contour (10-foot interval)

Depression contour (10-foot interval)

Elevation contour (50-foot interval)1400

Depression contour (50-foot interval)1400

W ater body (m anm ade shoreline)

UNIV ER S AL TR ANS V ER S E MER CATOR PR OJECTION, Z ONE 14NOR TH AMER ICAN DATUM OF 1983

SCALE 1:24 000

1 0 10.5MILES

1000 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000500FEET

1 0 1 20.5 KILOMETERS1000 0 1000 2000500 METERS

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GEOLOGIC UNITS CENOZOIC

Quaternary System Pleisto cene–Ho lo cene

Active sand – Active sand deposits are reworked sedim ents derived from alluvium, loess and Paleozoic units. The sedim ents are found along long, gentle slopes and in stream beds eroding loess, alluvium and Paleozoic units (Lane and Miller, 1965). The unit is represented by fine to coarse quartz sand and fine to coarse arkosic sand containing m inor amounts of silt and clay (Albert and S tram el, 1966), as well as weathered and eroded Paleozoic silt, shale, and carbonates. Thickness of the unit ranges up to 30 feet (Lane and Miller, 1965). Alluvium — Alluvium in S edgwick County is fine to coarse sand and fine to coarse arkosic gravel containing m inor amounts of silt and clay that grades upward into clayey silt. Alluvium from the Arkansas R iver is composed of unconsolidated gravel, sand, and silt and has an estim ated thickness of 75 feet (W illiam s and Lohm an, 1949). Pleistocene-age alluvium is present to a depth of nearly 50 feet and Pleistocene to possibly Pliocene to a depth of over 180 feet total depth (Lane and Miller, 1965). Alluvium of Q uaternary age lines the floodplain of the Little Arkansas R iver with lim ited extension up sm aller creeks. In certain areas alluvium m ay form low terraces of 10-20 feet above the floodplain (Aber, 1991). Alluvium found in sm aller creeks is composed of finer sedim ents and is variable in lithology (Moore, Jewett, and O’Connor, 1951). Its source is the shales and carbonates in the Perm ian W ellington Form ation and Pleistocene loess. Lo ess — W ind-blown loess deposits in S edgwick County are tan to pink-tan calcareous silt with zones of caliche and fine sand (Bevans, 1989). The loess ranges from Pleistocene to Holocene in age. Loess covers m any of the upland surfaces in S edgwick County (W elch and Hale, 1987) and rests unconform ably on the Perm ian W ellington Form ation and stratigraphically below thick (>5ft) soils. Terraces — Terraces consist of unconsolidated sedim ents in the Arkansas R iver floodplain (Lane, 1998). Terraces are predom inately gravel, sand, clay, and silt varying in thickness and occasionally contain clay and silt lenses (Bayne and O’Connor 1968). Terraces were subdivided by Bayne (1962) as representing deposition in the Illinoisan S tage (approxim ately equivalent to m arine isotope stage [MIS ] 6) and the W isconsinan S tage (MIS 2 to 5). The older Illinoisan S tage (MIS 6) terrace deposits are primarily silt and sandy silt (Bayne and O’Connor, 1968). S and and gravel beds are also known to locally contain clay and silt lenses (Bayne and O’Connor, 1968). Loess-derived silts, largely yellowish to reddish-brown in color, are found in the upper portion of these terrace deposits. These loess-derived deposits are approx im ately 40 feet thick in S edgwick County. (Lane and Miller, 1965). Later rejuvenation of the Arkansas R iver during the W isconsinan S tage (MIS 2-5) caused the river’s incision into earlier terrace deposits. This process deposited arkosic sand and gravel and subsequently silt and clay deposits (Bayne, 1962). In south-central Kansas, this unit is derived from Paleozoic and Mesozoic deposits and can reach 55 feet in thickness (Bayne, 1962).

CITED REFERENCES Albert, C. D., and S tram el, G. J., 1966, Fluvial sedim ent in the Little Arkansas R iver Basin, Kansas: U.S. Geological S urvey, W ater-S upply Paper 1798-B, 30 p.

Aber, J. S., 1991, S urficial geology of Butler County, Kansas, final report: Kansas Geological S urvey, Open-File R eport 91-48, 31p.

Bayne, C. K., 1962, Geology and ground-water resources of Cowley County, Kansas: Kansas Geological S urvey, Bulletin 158, 219 p.

Bayne, C. K. and O'Connor, H. G., 1968, Q uaternary S ystem, p. 59-67; in Z eller, D. E., (ed.); The stratigraphic succession in Kansas: Kansas Geological S urvey, Bulletin 189, 81 p.

Bevans, H. E., 1989, W ater resources of S edgwick County, Kansas: U.S. Geological S urvey, W ater R esources Investigations R eport 88-4225, 119 p.

Lane, C. W ., and Miller, D. E., 1965, Geohydrology of S edgwick County, Kansas: Kansas Geological S urvey, Bulletin 176, 100 p.

Moore, R . C., Jewett, J. M., and O’Connor, H. G., 1951, Geology, m ineral resources, and ground-water resources of Chase County, Kansas, part 1 — R ock form ations of Chase County: Kansas Geological S urvey, V olum e 11, p 1-16. http://www.kgs.ku.edu/General/Geology/Chase/.

W elch, J. E., and Hale, J. M., 1987, Pleistocene loess in Kansas — status, present problems, and future considerations; in Q uaternary Environm ents of Kansas, W . C. Johnson, ed., Kansas Geological S urvey, Guidebook S eries 5, p. 67 -84.

W illiam s, C. C., and Lohm an, S. W ., 1949, Geology and ground-water resources of a part of south-central Kansas, with special references to the W ichita m unicipal water supply, with analyses by R obert H. Hess and others: Kansas Geological S urvey, Bulletin 79, 455 p.