Post History
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.   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?