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Aulacostephanid ammonites from the Kimmeridgian (Upper Jurassic) of British Coumbia (western Canada) and their significance for
correlation and palaeobiogeography; Rogov, M; Poulton, T P. Bulletin of Geosciences vol. 90, no. 1, 2015 p. 7-20,
https://doi.org/10.3140/bull.geosci.1501 
Open Access (ESS
Cont.# 20150066)