Author: BASSET, M.G. ET AL.
Title: Lower Cambrian fossils from the Hell's Mouth Grits, St. Tudwal's Peninsula, North Wales.
Description: 1976. Jl. geol. Soc. Lond. vol 132; pp. 623-644, 5 fig. 3 plts. h.t. with mainly trilobites. Plain wrps.stapled extract.

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