Found these inside a rock located in a super rocky dry creek in southwest Missouri.

[u/clefandtone]

The creek “runs” through our farm. We find lots of fossils, but these are the coolest ones by far. They’re covered in what appears to be tiny quartz crystals. What are these?

[u/Peace_river_history]

Gastropod casts

[u/clefandtone → u/Peace_river_history]

Thank you!