Want to trace the footsteps of dinosaurs or pinpoint the exact location of extinct volcanoes? A new interactive geological map of Texas lets people browse everything from where dinos once roamed to the whereabouts of oil and gas formations.

The U.S. Geological Survey map, which can be accessed for free online, offers a unique window into the history of the ground beneath the Lone Star State. The map shows Texas at a scale of 1:250,000, and allows users to zero in on geographic layers of interest, such as specific fault lines or types of rocks.

Read More.