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Bisat |
1928 |
The Carboniferous goniatite zones of England and their continental equivalents.
Congrès de Stratigraphie Carbonifère, Heerlen 1927, C.R.B.: 117-133, pl.6, 6a; Liège.
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Bisat |
1950 |
The junction faunas of the Viséan and Namurian.
Transactions of the Leeds Geologists Association., 6 (3): 10-26, fig.1, pl.1,2; Kendal.
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