Texas
Texas covers an enormous range of geology—from Gulf Coastal Plain sediments to Hill Country limestones, West Texas basins, and ancient crystalline rocks in the Llano Uplift. That variety makes Texas a standout for building stones, fossil-bearing limestones, agates and jaspers, and a wide mix of igneous and sedimentary materials.
At a glance
- Common rock types: limestone, sandstone, shale, chert; igneous and metamorphic rocks in uplifted regions
- Notable materials: fossil limestones, silicified wood, agate/jasper, granites and rhyolites in select areas
- Where they come from: coastal and shelf sediments, interior carbonate platforms, basin deposits, and older uplifts
What collectors look for
Collectors often seek agates and jaspers from gravels, fossil specimens from limestone units, and distinctive building stones. Collect responsibly and confirm land access and collecting rules before visiting any site.
- Common rock types: limestone, sandstone, shale, chert; igneous and metamorphic rocks in uplifted regions
- Notable materials: fossil limestones, silicified wood, agate/jasper, granites and rhyolites in select areas
- Where they come from: coastal and shelf sediments, interior carbonate platforms, basin deposits, and older uplifts
What collectors look for
Collectors often seek agates and jaspers from gravels, fossil specimens from limestone units, and distinctive building stones. Collect responsibly and confirm land access and collecting rules before visiting any site.