14001400

14001400

15001500

16001600

15001500

1600

1600

17001700

18001800

1600160017001700 1800

1800

16001600

15001500

16001600

14001400

15001500

150015001600

1600

15001500

17001700 x 1977x 1977

1800

1800

16001600

18001800 1600

1600

1909 x1909 x

15001500

16001600

1800

1800

14001400

15001500

18001800

16001600

18001800

20002000

16001600

18001800

18001800

20002000

18001800

16001600

17001700

1500

1500

14001400

1400

1400

x 2042x 2042

x 2098x 209819001900

17001700

17001700

1800

1800

16001600

17001700

1854 x1854 x

19001900

17001700

16001600

1400

1400

16001600

x 1982x 1982

15001500

17001700

19001900

1500

1500

17001700

1500

1500

140014001500

1500

15001500

17001700

17001700

1600

1600

20002000

17001700

1800

1800

16001600

1585 x1585 x

17001700

150015001300

1300

14001400 1600

1600

19001900

17001700

1500

1500

15001500 16001600

18001800

1700

1700

1988 x1988 x 1500

1500

17001700

14001400

16001600 14001400

1500

1500

17001700

1600

1600

17001700

14001400

13001300

160016001800

1800

1700170019

0019

00

17001700

1600

1600

x 1558x 1558

13001300

x 1421x 1421

15001500

16001600

13001300

17001700

x 1934x 1934

15001500

x 1639x 1639 14001400

15001500 17001700

15001500

14001400

13001300

13001300 x 1506x 1506

14001400

1500

1500

16001600

17001700

15001500

16001600

14001400

14001400

13001300

14001400

x 1543x 1543

16001600

16001600

1400140015001500

17001700

16001600

1500150013001300

14001400

16001600 15001500

x 1955x 195516001600

1700170014001400

x 1542x 1542

13001300

15001500

13001300

140014001300130014001400

150015001400

1400

14001400

16001600

18001800

13001300

15001500

15001500

13001300

15001500

14001400

15001500

1900 x1900 x

1300

1300

15001500

1300

1300

12001200

13001300

12001200

14001400

x 1584

x 1584

13001300

1200

13001300

x 1473x 1473

1300

1300

x 1503x 1503 12001200

12001200

1200

1200

1191 x1191 x12001200

1200

1200

1262 x1262 x

12001200

12001200

x 1155x 115511

0011

00

11001100

11001100

11001100

11001100

1100

1100

11001100

11001100

11001100

11001100

1100

1100

x 1215x 1215

x 1248x 1248

12001200

11001100

x 1227x 1227

11001100

11001100x 1084x 1084

x 1165x 1165

x 1153x 1153

11001100

x 1075x 1075

1143 x1143 x

1100

1100

1100

11001100

1100

10001000

10001000

1000

1000 x 1023

10001000

11001100

11001100

1000

10001000

1000

1000

x 1100x 1100 1000

1000

1000

1000

10001000

1000

1000

10001000

10001000

11001100

110011001133 x1133 x

11001100

11001100

11001100

11001100

10001000

10001000

10001000

10001000

x 1068x 1068

x 1162x 1162

11001100

11001100

x 1117x 1117

11001100

11001100

x 1121x 112111001100

x 1098x 1098

x 1158x 115811001100

11001100

11001100

11001100

1187 x1187 x

1200

1200

x 1166x 1166

1162 x1162 x

11001100

12001200

1338 x1338 x 12001200

1300

1300

12001200

x 1353x 1353

x 1425x 1425

13001300

12001200

12001200

12001200

12001200

13001300

13001300

x 1272x 1272

13001300

12001200

12001200

12001200

12001200

12001200

1300130013001300

x 1385x 1385

1500150014001400

1200

1200

13001300

1397 x1397 x

13001300

x 1488x 1488

13001300

13001300

14001400

1400

1400

14001400

14001400

13001300

14001400

14001400

13001300

12001200

14001400

13001300

15001500

14001400

15001500

x 1847x 1847

2000

2000 15001500

17001700

14001400

16001600

1700

1700

16001600

19001900

14001400

13001300

x 1364x 1364

13001300

1455 x1455 x

13001300

13001300

14001400

15001500

17001700

15001500

16001600

19001900

1945 x1945 x

1600160019001900

16001600

19001900

16001600

17001700

19001900

17001700

19001900

16001600 16001600

17001700

17001700

19001900

15001500

1900

1900

19001900

15001500

16001600

17001700

1500

1500

14001400

13001300

1502 x1502 x

13001300

14001400

14001400

x 1878x 1878

17001700

150015001700170019001900

17001700

17001700

1500

1500

x 1950x 1950

18001800 17001700

x 2022x 2022 16001600 1500150014001400

1300

1300

1444 x1444 x

15001500

1400

1400

x 1201x 1201

x 1155x 1155

2056 x2056 x15

0015

00

1900

1900

14001400

18001800

12001200

12001200

x 1944x 1944

x 1949x 1949

x 2017x 2017

x 195

0x 1

950

18001800

15001500

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

DUDU

DU

DU

DU

DU

DU

DU

DU

DU

DU

D U

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

DU

Kdvru

Kdvrl

Kdvru

Kdvru

Qal

Qt

Qal

Kdvru

Kdvru

Qal

Kdvrl

Kdvru

Kdvru

Qal

Kdvrl

Kdvru

Qt

Qal

Qal

Kdvrl

Qal

Kgru

Qle

Kau

Qal

Qal

Kan

Kes

QTu

QTuQle

Kau

Qle

Kan

Kan

Qal

Kan+Kau

Kes

KauQt

QTu

Qal

QTu

Qle

Qle

Kdvru

Qt

Qal

Qt

KauQal

Kau

Kbu

Kau

QleQal

Qle

Kau

Kau

Qal

Qle

Qal

Qt

Qt

Kdvru

Qal

Kdvru

Kdvru

Qle

Kbu

Kef

Kbu

Kbu

Qt

Qt

Kbu

Qle

Qle

Kdr

Kdr

Qt

Kbu Qt

Qal

Qle

Kdvru

Qal

Qt

Qal

Qu

Qt

Qt

Qu

Kgru

Kdvrl

Kdvrl

Qal

Kdvrl

Kdvrl

Qal

Qal

Qal

Kdvrl

Kdvrl

Kgru

Kgru

Qu

Qu

Kdvrl

Qt

Qt

Kdvrl

Qu

Qt

Qt

Kdvrl

Qu

Qt

Qal

Kdvrl

Kgru

Qal

Qal

Qal

Kdvrl

Kgru

Kdvrl

Qt

Kdvrl

Qt

Qu

Qu

Qt

Qu

QalKgru

Qal

Qt

Qt

Qt

Kft

Qal

Qal

Kft

Kgru

Kdvru

Kbu

Kdvrl

Kdr

Kgru

QalQt

Kau

Kau

Kau

Qle

Kbu

Qle

Qle

Qal

Kbu

Kbu

Qle

Kef

Kef

Kef

Kbu

Kau

Kan

Kdvrl

Qle

Kdvru

Kdr

Qt

Qt

Kau

Kef Qal

Kau

Kbu

Qt

Kbu

KanQal

Qal

Qt

Qal

Qal

Kau

Qt

Qle

Qal

KanKan

Kan

Kan

Qle

Kan

Qle

Qle

Kau

Qt

Kan

Kau

Kau

Qal

Qal

QtKau

Qle

Qal

Ki

Kan

Kau

Qle

Qal

Qal

Kft

Kgru

Qt

Qt

Qt

Kdvrl

Kft

Qal

Kdvrl

Qal

Qal

Qal

Qt

QtKft

Kdvrl

Qt

Kft

Qal

Qt

Qal

Qal

Qal

Qal

Qal

Qal

Qt

Kft

Qal

Kgru

Kgru

Kdvrl

Kft

Kbu

Kbu

Woodard Cave Fault

Woodard Cave Fault

Parker Creek fault

Medina Lake fault

Vandenburg School fault

Diversion Lake fault

Seco Creek fault

Seco V

alley

Roa

d fau

lt

Woodard Cave

Rugh Sinkhole

SH 462

FM 1796

SH 187

SH 187

FM 1796

Hondo

Creek

Wards

Creek

Bear

Spring

Creek

Parkers

Creek

Creek

Cedar

Creek

Rocky

Creek

Parkers

Creek

Rancheros

Seco

Creek

Seco

Little

Creek

River

Sabinal

Creek

Elm

Med

ina

Cou

nty

Uva

lde

Cou

nty

99o30' W

99o30' W

99o22'30" W

99o22'30" W

99o15' W

99o15' W

29o22'30" N 29o22'30" N

29o30' N 29o30' N

29o37'30" N 29o37'30" N

FlatrockCrossing

Collins, 1999b

TexasMountain

Collins, 1997

ComancheWaterhole

Collins, 1999a

Sabinal NE

Collins, 1998

Quadrangle Mapping Base Index

MAVERICK BASIN

DEVILS RIVER TREND

SAN MARCOS

PLATFORM

BEXAR COUNTY

MEDINA COUNTY

Edwards Group facies map

Balcones

fault

zone

COMAL COUNTY

HAY

S CO

UN

TY

UvaldesalientUvaldesalient

UVALDE COUNTY

TRAV

IS C

OU

NTY

Modified from Clark (2003)

DU

DU

LIST OF MAP UNITS

Alluvium (Quaternary)Qal

Undivided terrace, slope-wash deposits, and fan deposits (Quaternary)

Qu

Terrace deposits (Quaternary)Qt

Leona Formation (Pleistocene)Qle

Uvalde Gravel, older alluvium (Quaternary & Upper Tertiary)

QTu

Mafic intrusive rocks (Upper Cretaceous)Ki

Escondido Formation (Upper Cretaceous)Kes

Anacacho Limestone (Upper Cretaceous)Kan

Anacacho Limestone and Austin Group, undivided (Upper Cretaceous)

Kan+Kau

Austin Group (Upper Cretaceous)Kau

Eagle Ford Formation (Upper Cretaceous)Kef

Buda Formation (Upper Cretaceous)Kbu

Del Rio Clay (Upper Cretaceous)Kdr

upper Devils River Formation (Lower Cretaceous)Kdvru

lower Devils River Formation (Lower Cretaceous) Kdvrl

Fort Terrett Formation (Lower Cretaceous)Kft

upper Glen Rose Limestone (Lower Cretaceous)Kgru

Stream/River

Geologic contact-certain

Normal fault-certain

Normal fault-inferred

Collapse feature

Quadrangle boundary

Explanation of Map Symbols

Cave

Edw

ards

Upp

er C

onfin

ing

Uni

tsLo

cal A

quife

rsE

dwar

ds A

quife

r Uni

tsE

dwar

ds L

ower

Con

finin

g U

nit

Medina and Uvalde County boundary

Roads

Map Location

TEXAS

Geology mapped by E. Collins (1997, 1998, 1999a, 1999b); C. Blome and J. Faith (2003, 2004). Geologic map data digitized and compiled by K. Murray in 2002 and 2003. Map product and report prepared by C. Blome, J. Faith and D. Pedraza in 2003 and 2004. This map is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic code.For product and ordering information:World Wide Web: http://pubs.usgs.gov/of/2004 or contact the U.S. Geological Survey Information Services, Box 25286, Federal Center, Denver, CO 80225. Telephone: 1-888-ASK-USGS

Base modified from U.S. Geological Survey 1:24,000 quadranglesUniversal Transverse Mercator projection, Zone 14, NAD 27

byCharles D. Blome, Jason R. Faith, Edward W. Collins, Diana E. Pedraza, and Kyle E. Murray

GEOLOGIC MAP COMPILATION OF THE UPPER SECO CREEK AREA,MEDINA AND UVALDE COUNTIES, SOUTH-CENTRAL TEXAS

2004

SCALE 1: 50 000

CONTOUR INTERVAL 20 FEETDATUM IS MEAN SEA LEVEL

3 0 31.5Miles

4 0 42Kilometers

Mag

net

ic N

ort

h

Tru

e N

ort

h

Approximate meandeclination, 1969

9.5 o

U.S. DEPARTMENT OF THE INTERIORU.S. GEOLOGICAL SURVEY

OPEN FILE REPORT 2004-1430