Draw

Cherry

Bull

Waterhole

Draw

Live

Oak

Creek

Salmon Sycamore

Creek

WEST

NUECES

RIVER

Dry

Sycamore

Creek

Sycamore

Creek

Sycamore C r

East

Fork Sycamore

Creek

Las

Moras

Lindsay

Creek

Elm

Las Moras

Mountain

Turkey

Mountain

East

Fork

Turkey Creek

West

Fork Turkey

Creek

Lost

Creek

Draw

Che rr yChe rr y

B ul l

Wa t e rhol e

h

t e rh

l e

D r a wD r a w

L i v eL i v eL

O a k

e e k

Cr e e kCr e e k

Salmon

r e

S y c a m o r eS

c a

o

e

C r e e k

W ES T

N U ECES

RIVER

Dry

Syca

mo

re

Creek

c

e

Sycamore

Creek

r e

S y c a m o r eS

C

r

s

t

Eas

t

E

Fork

Sy

c

a

m

o

re

o

e

ee Cr k

L a s

M o r a s

o r a s

L

i

n

d

s

a

y

Cr e e k

El m

LasMoras

Mountain

Turkey

Mountain

East

Fork

Turkey

Cre

ek

West

Fork

Turkey

Creek

Lost

Creek

3

4

20 4

7 50

8

3

3

4

2 4

5

7

12

3

10

3

5

6 7

10

2 2

3

6

8

12

5

Kau

Kau

Kau

Kau

Kau

Kau

Kau

Kau

Kau

Kau

Kau

Kau

Kbu

Kbu

Kbu

Kbu

Kbu

Kbu

Kbu

Kbu

Kbu

Kbu

Kbu

Kbu

Kbu

Kbu

Kbu

Kbu

Kdr

Kdr

Kdr

Kdr

Kdr

Kdr

Kdr

Kdr

Kdr

Kdr

Kdr

Kdr

Kdr

Kdr

Kdr

Kdr Kdr

Kdr

Kdr

Kdr

Kdvr

Kdvr

Kdvr

Kdvr

Kdvr

Kdvr

Kef

Kef

Kef

Kef

Kef

Kef

Kef

Kef

Kef

Kef

Kef

Kef

Kef

Kef

Kef

Kef

Kef

Kef

Kef

Kef

Kef

Kef

Kgr

Kgr

Kgr

Kgr

Kgr

Kgr

Kgr

Kgr

Kgr

Kgr

Ki

Ki

Ki

Ki

Ki

Ki

Ki

Ki

Km

Km

Km

Km

Km

Km

Km

Km

Km

Km

Km

Km

Km

Km

Km

Kml

Kml

Kml

Kml

Kml

Kml

Kml

Kml

Kml

Kml

Kml

Kml

Kml

Kml

Kml

Kml

Kml

Kml

Kml

Kml

Kml

Kml

Kml

Kml

Kml

Kml

Kml

Kml

Kml

Kml

Kml

Kmm

Kmm

Kmm

Kmm

Kmm

Kmm

Kmm

Kmm

Kmm

Kmm

Kmm

Kmm

Kmm Kmm

Kmm

Kmm

Kmm

Kmm

Kmm

Kmm

Kmm

Kmm

Kmm

Kmm

Kmm

Kmm

Kmm

Kmm

Kmm

Kmm

Kmm

Kmm

Kmm

Kmm

Kmu

Kmu

Kmu

Kmu

Kmu

Kmu

Kmu

Kmu

Kmu

Kmu

Kmu

Kmu

Kmu

Kmu

Kmu

Kmu

Kmu

Kmu

Kmu

Kmu

Kmu

Kmu

Kmu

Kmu

Ksp

Ksp Ksp

Ksp

Ksp

Ksp

Ksp

Ksp

Ksp

Ksp

Ksp

Ksp

Ksp

Ksp

Ksp

Ksp

Ksp

Ksp

Ksp

Ksp

Ksp Ksp

Ksp

Ksp

Ksp

Ksp

Ksp

Ksp

Ksp

Ksp

Kwn

Kwn

Kwn

Kwn

Kwn

Kwn

Kwn

Kwn

Kwn

Kwn

Kwn

Kwn

Kwn

Kwn

Kwn

Kwn Kwn

Kwn

Kwn

Kwn

Kwn

Kwn Kwn

Kwn

Kwn

Kwn

Kwn

Qaf

Qaf

Qaf

Qaf

Qaf

Qaf

Qaf Qaf

Qaf

Qaf

Qaf

Qaf

Qc Qc

Qc

Qc

Qc

Qc

Qc

Qc

Qc

Qc

Qc

Qc

Qc

Qc

Qc

Qc

Ql

Ql

Ql

Ql

Ql

Ql

Qls

Qls

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

Qt

Qt

Qt

Qt

Qt

Qt

Qt

Qt

Qt

Qt

Qt

Qt

Qt

Qt

Qt

Qt

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

Qal

Qal

Qal

Uvalde

Del Rio

Brackettville

Amistad

Reservoir

Rio

Grande

MEXICO

TEXAS

WEST GULF COASTAL PLAIN

EDWARDS PLATEAU

Nueces River

River

ANACACHO MTNS

90

277

83

131

55

Devils

MAP AREA

Pinto

Creek

East

Fork

Sycamore Cr

Griffin

Creek

Dry Sycamore

Cr

Lost Creek

Bull

Waterhole Draw

Live

Oak

Creek

Sycamore

Cr

Chalk 

Cr

Salmon

Peak

West

Nueces

River

Grass Valley

Arenosa

Creek

Rough Hollow

Elm

Creek

Lindsey

Creek

Las

Cr

Fort Clark Springs

Moras

Elm

Creek

East

Pinto

Creek

Pinto

Mountain

Las Moras

Mountain

Turkey Mountain

Brackettville

West Fork Turkey

Creek

East

Fork Turkey

Creek

Sycamore

Creek

Alamo

Village

Generalized map with shaded relief. Black box indicates the area of figures 6 and 7, the type 

section and type locality of the West Nueces Formation ( Lozo and Smith, 1964). The topographic 

relief block diagram (above) places the mapped area in relation to highways and adjoining cities. 

It depicts a part of south-central Texas that includes the relatively low coastal plain in the 

foreground (pale and medium greens), and the higher plateau (dark terra cotta and white) in the 

middle and back ground to the north. The Balcones Escarpment separates these two provinces and 

is shown as a narrow, uneven yellow zone that extends east-west (right-left) in the United States. 

The region shown is approximately 100 mi in the east-west direction and 70 mi in the north-south 

direction (U.S. Geological Survey National Elevation Dataset (NED) 30-m resolution available at 

http://ned.usgs.gov/). 

Kickapoo

Cavern

State Park

TULAROSA

ROAD 

RIVER

ROAD

131

674

90

90

334

334

BRACKETTVILLE-LAGUNA

ROAD

100°30’0” 100°07’30”

29°15’

29°37’30”

0

0

5 MILES

6 KILOMETERS

Area of figs. 

6 and 7

0

20

40

60

80

100

120

140

160

180

200

220

240

260

280

300

320

340

360

380

400

420

440

460

480

500

520

540

560

580

600

620

640

660

680

700

720

740

760

780

800

820

840

860

880

900

920

940

960

980

1,000

1,020

1,040

1,060

Austin Chalk

(Kau)

Eagle 

Ford

Shale

(Kef)

Buda Limestone

 (Kbu)

Del Rio Clay

(Kdr)

(~128’

thick)

Top of Edwards

Aquifer

(~100’

thick)

Salmon Peak

 Limestone (Ksp)

(140’ 

thick)

Figure 8. Gamma-ray log of 1,055-ft deep drill hole 

RP–70–55–2AA, drilled April 29, 1982. Location: Lat 

29°14 ́22 ̋N., long 100°10 ́10 ̋, 1.4 km south of the 

boundary of the map area. Log shows gamma-ray record 

(from top to bottom) of partial Austin Chalk (Kau), Eagle 

Ford Formation (Kef), Buda Limestone (Kbu), Del Rio 

Formation (Kdr), and partial Salmon Peak Limestone 

(Ksp). Depth below ground level is in feet.

Ground level

 

 

 

 EDWARDS AQUIFER STUDY

LOGGING INFORMATION FOR RP 70 55 2AA–0482–G

 WIDCO 1200 - GAMMA LOG Odlaw Quadrangle

Date 4-29-82 Well Number and Name RP–70–55–2AA

Party MJA, FL, TS

Lat-Long. 29 ̊14’22’

100 ̊10’10’

Elevation 1,080

Depth to Water 106 ft.

MP Ground level

GAMMA LOG

Initial Counter Setting

TC Switch 3

5.0 ft. Final Counter Setting 5.0 ft.

Rec. Out 2.50 *ft./min.

Zero 5.48

Vert. Scale 2.0

Log Depth 1,055

Span 9.11

Logging Speed 2.5

29°15’

29°22’30”

29°30’

100°30’

100°30’

29°37’30’’

100°07’30”

29°37’30”

29°15”

100°22’30” 100°15’ 100°07’30

100°22’30” 100°15’

Drill hole RP–70–55–2AA

1.4 km southeast of map boundary (see fig. 8) Geology mapped by D.W. Moore in 2005

Digital map database by Scott Snyders, Tom Adamson, Lyndsay 

Hazen, and D. Paco Van Sistine

Editing and digital cartography by L.J. Binder

Denver Publishing Service Center

SCALE 1: 50 000

1 1/ 2 0 1 2 34 MILES

1 .5 0 1 2 3 4 5 KILOMETERS

TEXAS

MAP LOCATION

CONTOUR INTERVAL 10 METERS

NATIONAL GEODETIC VERTICAL DATUM OF 1929

For more information concerning this publication, contact:

Team Chief Scientist, USGS Geology and Environmental Change Science Center

Box 25046, Mail Stop 980

(303)236-5344

Or visit the Earth Surface Processes Team site at:

http://esp.cr.usgs.gov/

Any use of trade, product, or firm names is for descriptive purposes only

and does not imply endorsement by the U.S. Government.

Although this information product, for the most part, is in the public 

domain, it also contains copyrighted materials as noted in the text. 

Permission to reproduce copyrighted items for other than personal use

must be secured from the copyright owner. 

Publishing support provided by: 

Denver Publishing Service Center

Manuscript approved for publication December 22, 2009

This and other USGS information products are available at

http://store.usgs.gov/

U.S. Geological Survey

Box 25286, Denver Federal Center

Denver, CO 80225

To learn about the USGS and its information products visit

http://www.usgs.gov/

1-888-ASK-USGS

This report is available at:

http://pubs.usgs.gov/sim/3105

U.S DEPARTMENT OF THE INTERIOR

U.S. GEOLOGICAL SURVEY

SCIENTIFIC INVESTIGATIONS MAP 3105

Version 1.0

Pamphlet accompanies map

Suggested citation:

Moore, D.W., 2010, Geologic map of the Edwards aquifer and related rocks in northeastern 

Kinney and southernmost Edwards Counties, south-central Texas: U.S. Geological Survey 

Scientific Investigations Map 3105, scale 1:50,000, 18-p pamphlet.

GEOLOGIC MAP OF THE EDWARDS AQUIFER AND RELATED ROCKS IN NORTHEASTERN KINNEY AND SOUTHERNMOST EDWARDS COUNTIES, SOUTH-CENTRAL TEXAS

By

David W. Moore

2010

29°30’

29°22’30”

WN I

WN II

M 1 

CONVERSION FACTORS

Multiply By To obtain

inches (in) 2.54 centimeters (cm)

feet (ft) 0.3048 meters (m)

miles (mi) 1.609 kilometers (km)

Base from U.S. Geological Survey Del Rio, Texas-Coahuila,1986, 

and Camp Wood, Texas, 1985, metric 100,000-scale maps 

1927 North American Datum (NAD 27)

Projection: Universal Transverse Mercator, zone 14

Texas coordinate system, south central zone

Shaded relief base from U.S. Geological Survey National Elevation 

Dataset (NED, http://ned.usgs.gov/) APPROXIMATE MEAN

DECLINATION, 2005 TRUE NORTH

MAGNETIC NORTH

6°

50

4

EXPLANATION

Contact

Gradational boundary—A boundary on the geologic map depicted by a change in 

color of map units, but lacking a contact line symbol. The place where evidence is 

lost that allows detailed mapping of units and, across the boundary, only a more 

generalized, undivided unit is identifiable

Sinkhole

Terrace scarp

Dike

Normal fault—Solid where location is certain; dashed where approximately located, 

dotted where concealed. Bar-and-ball symbol on apparent relative downthrown 

side. Arrow and number indicate dip of fault plane

Normal fault, displacement unknown—Solid where location is certain, dashed where 

approximately located 

Anticline—Solid where location is certain; dotted where concealed

Syncline—Solid where location is certain; dashed where approximately located

Monocline—Solid where location is certain; dotted where concealed

Horizontal bedding

Inclined bedding—Showing strike and dip

Inclined bedding, estimated—Showing strike and dip; bedding attitude estimated from 

oriented stereographic model

Type or reference section—Type or field reference section location, with name of site 

and source

WN I—Type section, West Nueces Formation (Lozo and Smith, 1964)

WN II—Type section, West Nueces Formation (Lozo and Smith, 1964)

M 1—Outcrop reference section, McKnight Formation (Lozo and Smith, 1964)

WN I

WN II

M 1

50

Qal

af

Qc Qaf Qt Ql Qls

Kmm Km

Ki

Kau

Kef

Kbu

Kdr

Ksp

Kmu

Kml

Kgr

Kwn

Kdvr

Holocene

Pleistocene

QUATERNARY

Upper

Lower

CRETACEOUS

CORRELATION OF MAP UNITS

Edwards

aquifer

af

Qal

Qc

Qls

Qaf

Qt

Ql

Ki

Kau

Kef

Kbu

Kdr

Ksp

Km

Kmu

Kmm

Kml

Kwn

Kdvr

Kgr

LIST OF MAP UNITS

[Due to the addition of a shaded-relief base, colors in the List of Map Units 

may not exactly match unit colors on the map]

Artificial fill (modern)

Alluvium (Holocene and late Pleistocene)

Colluvium (Holocene and late Pleistocene)

Landslide deposit (Holocene and late Pleistocene)

Fan alluvium (Holocene and late Pleistocene)

Terrace alluvium (Pleistocene)

Leona Formation (Pleistocene)

Igneous intrusive rocks (Late Cretaceous)

Austin Chalk (Upper Cretaceous, Santonian-Coniacian)

Eagle Ford Formation (Upper Cretaceous, Turonian)

Buda Limestone (Upper Cretaceous, Turonian-Cenomanian)

Del Rio Formation (Upper Cretaceous, Cenomanian)

Salmon Peak Limestone (Lower Cretaceous, upper Albian)

McKnight Formation, undivided (Lower Cretaceous, Albian)

Upper member

Middle member

Lower member

West Nueces Formation (Lower Cretaceous, Albian)

Devils River Limestone (Lower Cretaceous, Albian)

Glen Rose Formation (Lower Cretaceous, lower Albian)