Hettangian through Aalenian (Jurassic) guide fossils and biostractigraphy, northern Yukon and adjacent Northwest Territories

Report documenting the occurrence and biostratigraphic importance of fossils characteristic of the Lower Jurassic and Aalenian formations of northern Yukon and the adjacent District of Mackenzie. The report describes the stratigraphy and fossil occurrences and the paleobiogeographic affinities, then presents systematic paleontological notes by class, order, genus, and subgenus. Listing of the fossils (mainly ammonites and marine bivalves) of the Jurassic marine sandstone sequences of the Bug Creek Group and the shale and siltstone of the Kingak Formation, in the Richardson Mountains of northern Yukon and adjacent Northwest Territories