New stratigraphically and phylogenetically important olcostephanid (Ammonitida) taxa from the uppermost lower and upper Valanginian of Sverdrup Basin, N.W.T.  by E. Kemper and J.A. Jeletzky
Contributors: Jeletzky, J.A.
Publisher: Dept. of Energy, Mines and Resources
Place of publication: Ottawa
Language: eng
Number of pages: 25
Notes: 11