Where: California · North America · approx. 37.9, -122.7 (vicinity only)
Why this spot: Duxbury Reef shore platform historically picked for agates
What turns up: agate and jasper to observe only
Access: Restricted.
Inside a marine protected area now, so look but leave material in place.
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.