Where: Wales · Europe · approx. 53.12, -4.03 (vicinity only)
Why this spot: Ordovician
What turns up: Slate, spotted rock and minor minerals on quarry spoil (Dinorwig/Penrhyn area)
Access: Gray area.
Cwm Idwal is a NNR (no collecting); quarry spoil access varies and is often private/dangerous.
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.