Geologic History
Geology Links
Dallas Co. Geologic Map
Geologic Cross Section
DFW Fossil Maps
Geologic Time Scale
Dallas Co. Soil Map









 A Natural History of North Central Texas

Geology Links
  Geologic History   Geology, Soil, Hydrology   Geography-Maps-GIS
  Geo Resources
Geology, Soils, and Hydrology


Surface Geology Map of Dallas County
This map was compiled in 1965 by the Dallas Geological Society showing local geology. Courtesy of Kevin Woller. Geology digitized by Kevin Woller, University of Texas at Dallas.

Geology of Dallas and Fort Worth; Geologic Detail Map of Dallas County and Tarrant County

Geologic Cross-Section of North Central Texas

Surface Geology of Dallas and Tarrant Counties, Texas by Phil Scoggins of The Dallas Paleontological Society.

Comprehensive Geologic Analysis of North Texas Super Collider Project

Local Area Cretaceous Cross Section
An axial cross section highlighting sloping cretaceous rocks underlying North Central Texas on top of the Paleozoic basement.

The Diminutive Cretaceous Fossils of Rufe Snow  Ammonites, crabs and other small crustaceans, parts of brittle stars and asteroid starfishes, an echinoid, shark teeth and bony fish vertebrae, pelecypods and gastropods make up the more common fossils.

A great collection of fossils from our area can be viewed on-line at Lance Halls' web site NorthTexasFossils.com

The Pawpawsaurus
Along the shores of a seaway, in the area which is now north central Texas, lived one of the most primitive known of the "nodosaurid" dinosaurs. It is called "Pawpawsaurus".  Photo album of fossils found in Fort Worth.

The Balcones Escarpment
The escarpment marks the break between two physiographic divisions of North America: the Great Plains and the Coastal Plains. In Texas this break is denoted by the change from Hill Country/Edwards Plateau uplands on the west to the Blackland Prairie on the east. This site contains the full, on-line version.

Photos taken at Glen Rose in the Paluxy of the "footprints" by Robert Nunnally shown in his Flickr page. More controversial information regarding the dinosaur footprints. Texas Parks and Wildlife dinosaur page. Footprint page from UT Austin.


Dallas County Soil Map
A soil-type distribution map for Dallas County. See this link for a page describing Houston Black, the Texas State Soil.


Edwards-Trinity Aquifer System
The aquifer system consists of three complexly interrelated aquifers-the Edwards-Trinity, the Edwards, and the Trinity aquifers. This hydrogeological resource is part of the USGS Ground Water Atlas of the United States.

Reservoir Conditions for River Basins in Texas
This interactive page allows you to build a custom summary table or a custom sequence of graphical or tabular data for one or more stations of real-time hydrologic data for about 520 sites in Texas. Data and graphs can be obtained for all data collected during the last 1 to 4 hours at stations by satellite telemetry.

Texas WaterNet
Texas Water Resources Institute Research, Technology Transfer, and Training in Water Resources Areas.

Current Hydrological Data for North Texas Rivers
Texas River Recreation Advisory River Flood Warnings; River Flood Statement; River Statement; River and Lake Stages.

The Hydrodynamics of the Woodbine Aquifer, Collin County, Texas
The water of the Woodbine aquifer supplies water for agriculture and for urban and suburban development in Collin County, Texas. How has this use altered the aquifer over the past twenty years? These materials were developed by Lance Christian, Department of Geography, University of Texas at Austin, 1998.

Ground Water Reports of the Texas Water Development Board: Cretaceous formations of North Central Texas | Ground-Water Availability in Texas | Major and Minor Aquifers of Texas | Updated Evaluation of Water Resources in Part of North-Central Texas, 1990-1999 | Evaluation of Water Resources in Parts of the Rolling Plains Region of North Central Texas .

Texas Water Development Board
The Texas Water Development Board's (TWDB) mission is To provide leadership, planning, financial assistance, information, and education for the conservation and responsible development of water for Texas.

Paleolimnology of White Rock Lake from analysis of lake sediment cores. Read more and similar RE: water quality analysis methods.

Texas Geological Maps

Geological Maps of Texas

Texas Geologic Map
Geologic Map
Texas Tectonic Map
Tectonic Map

Texas Landforms Map
Landforms Map

Texas Physiographic Map
Physiographic Map
Texas River Systems
River Basins Map

Texas Geology

Texas Through Time
A Microsoft PowerPoint Presentation of Plate Tectonics with Texas as the focal point, The Making of Texas. Sorry Aggies. Texas is burnt orange.

Cretaceous Geology of Texas
Cretaceous Stratigraphy of Texas with cross sections.

Learning About Texas Fossils
The state, having about 600 million years of geologic history, has fossils ranging in size from microscopic creatures to giant dinosaurs. With the distance learning capabilities of the Internet, Texas students and teachers can use the study of fossils as a thematic, interdisciplinary science-based unit for all age levels of students.

Texas Geology Video
Local, regional and state geology explained by Devin Dennie on uTube. Sit back and watch.

Seismicity of Texas
Seismicity Map of Texas Earthquake locations 1990 - 2006.

Minor aquifers in Texas
In Texas, a minor aquifer is defined as one that supplies large quantities of water in small areas or small quantities of water in large areas.

Dinosaurs of Texas
A systematic reference of dinosaurs in Texas by geologic time by Jon Baskin, TAMU.

River Systems of North Central Texas

Trinity River Basin Home Page
USGS National Water-Quality Assessment (NAWQA) web page for the Trinity River Basin. A comprehensive treatment for water quality of our main river system in North Central Texas  Trinity River Corridor development master plan.

Watershed Reports in North Central Texas by the EPA - listed by watershed name: Cedar, Chambers, Denton, East Fork Trinity, Elm Fork Trinity, Lower West Fork Trinity, Middle Brazos Lake Whitney, Middle Brazos Palo Pinto, North Bosque, Richland, Upper Sabine, Upper Trinity, Upper West Fork Trinity

Trinity River Basin Water Quality
The Trinity River basin NAWQA study project staff manage the exchange of information about water-quality issues of regional and local interest; the identification of sources of data and information; assistance in the design and scope of project products; and the review of project planning documents and reports.

Reflections on the Trinity
This publication addresses and supports the goals and ideas of the Trinity River COMMON VISION Program. (current issue of the newsletter)

Atlas of Texas Surface Waters
Book of color maps depicting the state's surface waters (divided by classified segments), including its lakes, bays, ponds, reservoirs, streams, rivers, estuaries and wetlands. GIS Data for the Atlas of Texas Surface Waters

GIS Data for The Trinity Basin - purchase from NCTCOG.

  Top of Page

Geography, Maps and GIS


Physiography of Texas
Each physiographic province is distinguished by characteristic geologic structure, rock and soil types, vegetation, and climate.

The Physical State of Texas
The Texas Almanac.

North-Central Texas Prairies
A geographic synopsis of prairie lands in western North Central Texas.

A geography and history of the great plains from Mexico and Texas to Canada.

Living With the Trinity a River's Story
This is a fabulous up to the minute on-line 60-minute PBS documentary sponsored by the Meadows Foundation. It takes you from the many headwaters through the geography of the Trinity River Corridor through North Central Texas and on to one of the largest freshwater estuaries in the world. It provides point and click access to images, movies, data, and informational links regarding the Trinity River and the revitalization of this key and vital resource. Trinity Floodplain Map

Texas Natural Resources Conservation Service (USDA)
The USDA Natural Resources Conservation Service provides leadership in a partnership effort to help people conserve, maintain, and improve our natural resources and environment for Texas with detailed land analysis of the region.


NCTCOG's Digital Atlas for North Central Texas
The Digital Atlas for the North Central Texas region developed to provide an interactive, on-line street map reference guide of the NCT area.

NCTCOG Bike Trail Maps and Atlas
The Interactive Digital Bike Trail Atlas for North Central Texas.

TXDOT County Maps Graphic Interface
Graphical interface to the Texas Department of Transportation County Maps. Select your county, click on an region or city, and 'zoom in'. Select by county or place (such as lake, university, etc.)

Texas Map Collection
Large collection of Texas Maps, Department of Information Resources, ancient maps archived from Texas Gov Land Office.

Texas - Detailed Maps
Texas Detailed Maps of the Perry-Castañeda Library Map Collection, The University of Texas at Austin. Texas.gov Flickr page!!

More Texas Maps
Texas Detailed Maps collection from all places in Norway!!.

Geologic Atlas of Texas

Map Sources & On-line Maps

USGS Geologic Map Database
Find information about maps and related data for: geology, hazards, earth resources, geophysics, geochemistry, geochronology, paleontology, and marine geology.

Texas GIS Data Download
Access TNRIS digital datasets directly through the online Data Search & Download, or go to Ordering Services to work with TNRIS staff on a custom order.

MSR Maps Server
The Microsoft Research Maps Web site is one of the world's largest online databases, providing free public access to a vast data store of maps and aerial photographs of the United States.

The TopoZone is the Web's center for recreational and professional topographic map users. We've worked with the USGS to create the Web's first interactive topo map of the entire United States.

Maptech Mapserver
Free Maptech map server creates on-line topo, nautical, aero maps for the location of your choice.

Geographical Summary by County

Go To GIS User Dot Com

  Top of Page

Geo Resources

Virtual Texas Fossil Exhibit
Scratching the Surface Again, a virtual visit to the museum to learn about Texas fossils. Sponsored by the Texas Memorial Museum at UT Austin.

TNRIS Info Services - WWW
The Texas Natural Resources Information System (TNRIS) is the state's clearinghouse and referral center for natural resources data. Its primary purpose is to make data available to data users quickly and reliably.

The Bureau of Economic Geology
The Bureau of Economic Geology is a major contract-based research unit of UT Austin. Bureau research is being conducted in advanced geotechnology; oil and gas discovery and recovery optimization; geophysics; environmental, waste-disposal, and hydrogeological studies; coastal processes; and coal and mineral resources.

UTD Geosciences Program
University of Texas at Dallas Geology Programs. UTD's huge, comprehensive listing of GIS and Remote Sensing Resources on the Internet.

SMU Dept. of Geology
(DOGS) Department of Geology, SMU.

Univ. of Texas Dallas Bruton Center
GI Science at UT-Dallas.

Fort Worth Geological Society
Dallas Geological Society

UNT Department of Geography
The Department of Geography is engaged in research projects ranging from coastal geomorphology and groundwater hydrology to medical geography, world cities, economic diversification and geographic information systems/remote sensing.

TCU Geology and ENSC Home Page
TCU Geology Department and Center for Remote Sensing.

US Geological Survey in Texas
U.S. Geological Survey in Texas information.

Sky above 32°47'8"N 96°47'36"W
Welcome to Your Sky, the interactive planetarium of the Web. You can produce maps in the interactive forms for any time and date, viewpoint, and observing location. This is my part of the sky in North Central Texas. Enter your latitude and longitude to find yours.

Texas Astronomical Society of Dallas
The Society was chartered in 1955 to promote the study of astronomy and related fields and to pursue observation and construction of instruments as a hobby.


Geologic Time Scale
Illustrated Glossary of Geologic Terms
Minerals By Name
Virtual Geology Classroom

Earth Science Resources: Geology, Oceanography, Astronomy & Ecology
Wow! It's huge.

Earth Science World
Earth Science World is the place to explore your interests in the Earth and in science.

Earth and Moon Viewer
You can view either a map of the Earth showing the day and night regions at this moment, or view the Earth from the Sun, the Moon, the night side of the Earth, above any location on the planet specified by latitude, longitude and altitude, from a satellite in Earth orbit, or above various cities around the globe.

US Geological Survey
As the Nation's largest earth science research and information agency, the USGS maintains a long tradition of providing "Earth Science in the Public Service."

Zoom Dinosaurs
An educational "all-you-ever-wanted-to-know" about dinosaurs page, sponsored by Disney. An excellent resource.

Exploration and Production Geology Forum
A members discussion forum for related topics of petroleum production and geology. Join, sign on and participate.

National Assoc. of Geology Teachers

Internet Geosciences Links

Society for Sedimentary Geology (SEPM)

Society of Petroleum Engineers

Geological Society of America

Mineralogy & Petrology Research

Geosciences K-12 Resources

Dino Russ' Lair

Oil Resources on the Web

Geology.com The Geological Society of America

  Top of Page