. Bulletin of the British Museum (Natural History), Geology. CEFNGWYN ASH MEMBER CEISWYN MUDSTONE FORMATION I. NANT. HIR FORMATION &-LLANUWCHLLYN- LLANYMAWDDWY- DINAS ?CORRIS. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)


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