South Dakota Devil's Toenail Oyster
Jurassic-Cretaceous
About South Dakota Devil's Toenail Oyster
The South Dakota Devil's Toenail Oyster is a mollusk fossil dating to the Jurassic-Cretaceous. Devil's Toenail Oyster is a realistic South Dakota fossil profile built around curved Gryphaea oyster common in marine clays and chalky beds. In this state, success usually comes from learning chalk beds, badlands mudstones, and river gravels, then timing runoff, reservoir drawdown, surf cuts, or road work that exposes fresh fossil-bearing rock instead of hunting blindly.
“According to TroveRadar, South Dakota Devil's Toenail Oyster fossils from the Jurassic-Cretaceous are found across South Dakota. TroveRadar's field database catalogs 795+ fossil entries for identification and collection guidance.”
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Identification Tips
- ●hooked lower valve
- ●thick shell
- ●gray marl matrix
- ●Check chalk beds, badlands mudstones, and river gravels
Where Found
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