Where: Nebraska · North America · approx. 42.8, -103.0 (vicinity only)
Why this spot: Pine Ridge escarpment gravels carrying the blue chalcedony that is Nebraska's state gem
What turns up: blue chalcedony, prairie agate, jasper
Access: Gray area.
Mix of national forest, state and ranch ground; collect only on open public parcels.
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.