Author: Bloxam, T.W., & Thomas, R.L., 1969.:
Title: Palaeontological and geochemical facies in the Gastrioceras subcrenatum marine-band and associated rocks from the North Crop of the South Wales Coalfield.
Description: Quart. Jour. Geol. Soc. London, 1243): pp. 239-281, 1 pl., 16 figs., refs. Large 8vo. Journal issue wrs.

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