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Other/historical region names associated with this locality: Gwynedd; Caernarvonshire
Greenschist facies Ordovician metabasite intrusions.
Ref.: Bevins, R.E. and Merriman, R.J. (1988) Compositional controls on coexisting prehnite-actinolite and prehnite-pumpellyite facies assemblages in the Tal y Fan metabasite intrusion, North Wales: implications for Caledonian metamorphic field gradients. Journal of Metamorphic Geology, 6, 17-39.
note: Grid ref. is for the summit of Tal y Fan and is not a specific location.
13 entries listed. 11 valid minerals.
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