What are these shells found in a gravel bank along the South Platte?
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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 but it was a good way from the river.
Does anyone know what animals would have originally have been in the shells?
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Keep in mind that rivers change course over time. It is entirely plausible that the river was where you found the shells recently (in geologic time). — Olin Lathrop about 2 months ago