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
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