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While hiking about a quarter-mile from the South Platte river I found these shells in a gravel bank. Most but not all had turned white, and they were in what looked like a gravel bank/deposit ...
#1: Initial revision
What are these shells found in a gravel bank along the South Platte?
While hiking about a quarter-mile from the South Platte river I found these shells in a gravel bank. ![Image alt text](https://outdoors.codidact.com/uploads/HymcB16Mu3DbNgCq3roR3avQ) ![Image alt text](https://outdoors.codidact.com/uploads/7fwGWeatpqidoAomDxcnzSkW) Most but not all had turned white, and they were in what looked like a gravel bank/deposit but it was a good way from the river. Does anyone know what animals would have originally have been in the shells?