Preliminary Geologic Map of Southernmost Texas, United States, and parts of Tamaulipas and Nuevo Leon, Mexico
Entry ID: USGS_OFR_2005_1409

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Summary
Abstract: The geologic map covers the southernmost part of Texas (parts of Jim Hogg,
Brooks, Starr, Hidalgo, Zapata, Willacy, Kenedy, and Cameron Counties), and
parts of Nuevo Leon and Tamaulipas, Mexico. Geologic units become younger from
west to east across the map area. The oldest rocks are in the western part of
the map area in the states of Nuevo Leon and Tamaulipas, Mexico, and include
mostly Cretaceous and Jurassic marine limestone, sandstone, shale, and
evaporite units exposed in a series of north to northwest-trending ranges.
These rocks are highly folded and are part of the Sabinas foldbelt, a
compressional terrain which formed during the Laramide (Cretaceous to
Paleocene) due to complex interactions related to subduction of the Pacific
plate beneath North America. The Mesozoic rocks were intruded by Miocene and
Oligocene igneous rocks.

The central and eastern portions of the map cover the Gulf Coastal Plain
province extending across southern Texas and Tamalupias and Nuevo Leon, Mexico.
Rocks in central part of the map area are Tertiary units consisting mostly of
sandstone, shale, and claystone units deposited in mixed marine and continental
environments. These Paleocene to Pliocene rocks dip east and formed as a result
of rapid deposition and progradation of sediments across the continental margin
into the Gulf of Mexico. The rapid infilling resulted in the development of
syndepositional growth faults which formed episodically from Paleocene to the
Pliocene. The growth faults are concealed beneath Pliocene and Quaternary
deposits and form a structurally complex Gulf Coast Tertiary basin. Tertiary
bedrock units are important because they contain oil and gas resources in south
Texas and in Tamaulipas, Mexico, and uranium deposits in the South Texas
Uranium District. In addition, some of these rocks also are aquifers for ground
water in the region. Rocks bordering the Gulf of Mexico are the youngest units
in the map area consisting mostly of Quaternary and modern coastal deposits in
deltaic, tidal flat, beach, barrier island, lagoonal, esturary, and dune
environments.

[Summary provided by the USGS.]

Related URL
Link: GET DATA
Description: Access data files for the Preliminary Geologic Map of Southernmost Texas.


Link: VIEW RELATED INFORMATION
Description: Report on the Preliminary Geologic Map of Southernmost Texas, United States,
and parts of Tamaulipas and Nuevo Leon, Mexico: Environmental Health
Investigations in the United States-Mexico border region.


Geographic Coverage
 N: 34.0 S: 26.0  E: -94.0  W: -110.0

Data Set Citation
Dataset Originator/Creator: William R. Page, D. Paco VanSistine, and Kenzie J. Turner
Dataset Title: Preliminary Geologic Map of Southernmost Texas, United States, and parts of Tamaulipas and Nuevo Leon, Mexico
Dataset Series Name: Open File Report 2005-1409
Dataset Release Date: 2005
Dataset Publisher: U.S. Geological Survey
Data Presentation Form: Online files
Online Resource: http://pubs.usgs.gov/of/2005/1409/


Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > TEXAS


Science Keywords
LAND SURFACE >GEOMORPHIC LANDFORMS/PROCESSES >COASTAL PROCESSES    [Definition]
LAND SURFACE >GEOMORPHIC LANDFORMS/PROCESSES >FLUVIAL PROCESSES    [Definition]
LAND SURFACE >GEOMORPHIC LANDFORMS/PROCESSES    [Definition]
OCEANS >COASTAL PROCESSES >BARRIER ISLANDS    [Definition]
OCEANS >COASTAL PROCESSES >BEACHES    [Definition]
OCEANS >COASTAL PROCESSES >DUNES    [Definition]
OCEANS >COASTAL PROCESSES >ESTUARIES    [Definition]
OCEANS >COASTAL PROCESSES >LAGOONS    [Definition]
SOLID EARTH >GEOMORPHIC LANDFORMS/PROCESSES >COASTAL LANDFORMS    [Definition]
SOLID EARTH >GEOMORPHIC LANDFORMS/PROCESSES >FLUVIAL LANDFORMS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >AGE DETERMINATIONS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >BEDROCK LITHOLOGY    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >IGNEOUS ROCKS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >METAMORPHIC ROCKS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >MINERALS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >SEDIMENTARY ROCKS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >SEDIMENTS    [Definition]


ISO Topic Category
ELEVATION
GEOSCIENTIFIC INFORMATION
INLAND WATERS
OCEANS


Platform
MAPS    [Information]


Keywords
OFR
Open File Report
Geology
Geologic Mapping
Rocks
Landscape


Data Set Progress
IN WORK


Originating Center
USGS


Data Center
Central Region, Publications, Geology Division, U.S. Geological Survey, U.S. Department of the Interior    [Information]
Data Center URL: http://cpg.cr.usgs.gov/pub/publications.html

Data Center Personnel
Name: U.S. GEOLOGICAL SURVEY CENTRAL PUBLICATIONS GROUP
Phone: (303) 236-5486
Contact Address:
Denver Federal Center
MS-902
Box 25046
City: Denver
Province or State: CO
Postal Code: 80225-0046
Country: USA



Distribution
Distribution_Media: Online
Fees: No fees


Personnel
CENTRAL PUBLICATIONS GROUP U.S. GEOLOGICAL SURVEY
Role: TECHNICAL CONTACT
Phone: 1-888-ASK-USGS
Phone: 1-888-275-8747
Email: ask at usgs.gov
Contact Address:
Denver Federal Center
City: Denver
Province or State: CO
Postal Code: 80225
Country: USA



Creation and Review Dates
DIF Creation Date: 2006-01-24
Last DIF Revision Date: 2006-01-24

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