South Dakota Devil's Toenail Oyster Identification
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.
Key Traits
- ●hooked lower valve
- ●thick shell
- ●gray marl matrix
- ●Check chalk beds, badlands mudstones, and river gravels
Era
Jurassic-Cretaceous
Type
mollusk
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