Where: Iowa · North America · approx. 40.82, -91.13 (vicinity only)
Why this spot: Type-area Burlington Limestone bluffs made almost entirely of crinoid debris
What turns up: crinoid stems and cups, blastoids, chert
Access: Gray area.
Roadcuts and bluff exposures on mixed rights of way; collect loose rock only.
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.