Abstract
Concludes that "the continuance into Westphalian A times of Namurian C or fairly typical Millstone Grit marine-band conditions was more prolonged in Westphalia than in Britain."
C. J. Stubblefield, W. Edwards; Marine bands in the Coal Measures of Britain and Germany. Geological Magazine 1950;; 87 (4): 261–262. doi:
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Concludes that "the continuance into Westphalian A times of Namurian C or fairly typical Millstone Grit marine-band conditions was more prolonged in Westphalia than in Britain."