This is the seam where Texas changes. A belt of faults, active roughly 15 to 20 million years ago, dropped the Gulf Coastal Plain down against the Edwards Plateau, and almost everything follows the line: the hills start on one side and the blackland begins on the other, the springs emerge along it, and the road pattern, the soil, the rainfall and the vegetation all shift within a few miles. San Antonio, New Braunfels, San Marcos, Austin, Waco and Dallas are all strung along it, sited on the water it brings to the surface. The faults are considered inactive now — there is no meaningful earthquake risk on them.
Getting there
30.2530, -97.7440
Locations are approximate and may be inaccurate, on private land, or otherwise inaccessible. Check before you travel.
Hear it from the road
Whistlestop tells you this story automatically when you drive past. No searching, no tapping, nothing to ask.
