Abstract
Stratigraphic and structural studies of the Middle Jurassic through Lower Cretaceous Bowser Basin in northwestern British Columbia are progressing with the aid of detailed ammonite biostratigraphy. Bathonian through Oxfordian cardioceratid and perisphinctid ammonites from the northwest corner of the basin permit correlation and development of a preliminary regional zonation. These faunas are unusually rich in perisphinctids and phylloceratids, perhaps indicating open access to the Pacific Ocean. One Callovian fauna studied in detail includes dimorphic pairs assigned to Cadoceras (Stenocadoceras?) stenoloboide Pompeckj,, C. comma Imlay,, and Choffatia sp.
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