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Calver & Ramsbottom |
1961 |
Stratigraphical Palaeontology. In: J.R. Earp et al.: Geology of the Country around Clitheroe an Nelson.
Memoir of the Geological Survey of Great Britain, Expl. one-inch Geol. Sheet 68, New Series: 174-207, pl.10,11; London.
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Ramsbottom & Calver |
1962 |
Some marine horizons containing Gastrioceras in North West Europe.
Quatrième Congrès International de Stratigraphie et de Géologie du Carbonifère, Heerlen 1958, Compte Rendu 3: 571-576, 2 figs., pl.14, 15, Heerlen.
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