Where: Iowa · North America · approx. 42.49, -90.85 (vicinity only)
Why this spot: Maquoketa Formation cut near Graf packed with cephalopods and brachiopods
What turns up: orthocone cephalopods, brachiopods, graptolites
Access: Gray area.
Public road right of way; collect loose material with care for traffic and adjacent land.
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.