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The Portlandian strata of the Bas Boulonnais, France:

Townson, W.G. ; Wimbledon, W.A.
Proceedings of the Geologists' Association.  90 (1979)  1-2 - p. 81-91 , 1979
Link: https://doi.org/10.1016/s0016-7878(79)80035-8