Wyoming
Wyoming’s geology includes mountain uplifts, broad basins, volcanic provinces, and world-famous sedimentary sequences. The state’s stone and fossil interest is wide-ranging—sandstones and limestones, volcanic rocks in places, silica-rich stones in gravels, and abundant fossil-bearing strata.
At a glance
- Common rock types: sandstone, shale, limestone; igneous and metamorphic rocks in uplifts; volcanic rocks in select regions
- Notable materials: fossil strata, chert and jasper-like silica stones, volcanic rocks and tuffs
- Where they come from: Rocky Mountain uplift, basin sedimentation, and volcanic activity
What collectors look for
Collectors often look for fossils in appropriate formations and interesting silica-rich stones from gravels. Always confirm collecting rules and land access before collecting.
- Common rock types: sandstone, shale, limestone; igneous and metamorphic rocks in uplifts; volcanic rocks in select regions
- Notable materials: fossil strata, chert and jasper-like silica stones, volcanic rocks and tuffs
- Where they come from: Rocky Mountain uplift, basin sedimentation, and volcanic activity
What collectors look for
Collectors often look for fossils in appropriate formations and interesting silica-rich stones from gravels. Always confirm collecting rules and land access before collecting.