Fossils of Texas

This is a good link for free topo maps for large areas of Texas. The same site has links for Texas Historical maps, World Maps etc.
http://www.lib.utexas.edu/maps/texas.html

Lance's Geo Maps for the North Texas Area   http://www.geocities.com/lancelhall/fossils/maps.htm

Texas Topo Maps  http://gis3.tceq.state.tx.us/website/irdrgview1/viewer.htm