Where: South Dakota · North America · approx. 43.75, -103.75 (vicinity only)
Why this spot: Mississippian
What turns up: Teepee Canyon (Black Hills) agate in limestone float
Access: Gray area.
Black Hills NF and private mix; hobby collecting on NF, permission on private claims.
Open in Mudlark Map →
Satellite view, historic-map overlays, tide/flow context and field notes are in the app. Exact research detail is part of Pro.
Pins are approximate by design. This page is historical research, not permission to dig. Check ownership and local law first.