APPROVED BY MEMBERS OF THE

Using the standard Jurassic zonal scheme, this work attempts to determine the ages of the four members of the Snowshoe Formation that crop out in the Izee area. As a corollary, regional correlations are possible. The stratigraphic relationship between the Snowshoe Formation, the subjacent Hyde Formation and the superjacent Trowbridge Formation is also investigated. Over one thousand fossils were collected from five stratigraphic sections and eight localities. The sections were measured using tape and compass techniques and the relative stratigraphic ranges of the fossils calculated using a computer program written specifically for this project. The ammonite fauna, dominated by the families Hildoceratidae, Stephanoceratidae and Sonniniidae, is systematically described. The Snowshoe Formation was deposited in marine waters of neritic depths during late Toarcian to early Callovian time, with the Bathonian apparently unrepre-sented. The lower member ·correlates in part with th