From the USGS:
Do you know where to find extinct volcanoes or where the dinosaurs once roamed in Texas? Can you find where unconventional oil and gas formations are present at the land surface?
A new interactive map viewer displaying the geology of Texas will help you explore what’s under your feet and across the state!
The new map viewer is an interactive web-based tool that allows a broad range of users to explore the geology of the Lone Star State at a scale of 1:250,000. Users can navigate the map with a simple click-and-point tool, or by using the location search tool to find common geographic place names, latitude/longitude coordinates and other areas of interest. The interactive map viewer allows users to turn data layers on or off, identify layers of interest and retrieve detailed information about each geologic formation, such as the feature name, geologic age and feature description.
The Texas Geology Web Map Viewer is the third generation in this series of Texas geologic mapping products, which is intended to provide data to a broad range of users interested in exploring the geology of Texas.
Direct to Map Viewer