During the past few years, an extensive bed-by-bed sampling program for ammonoids, pelagic bivalves and conodonts was conducted at the classic South Canyon (central Nevada) locality. This area, recognized as the best site for the study of the earliest Carnian in North America, has never before been examined with such an approach. Preliminary data, which are of interest for the discussion of the GSSP of the Carnian Stage (Upper Triassic Series), are herein presented. The Middle Member of the Augusta Mountain Formation (Star Peak Group) contains an unusually rich ammonoid, conodont and pelagic bivalve record. Furthermore, sampling data yielded by these three biostratigraphic tools indicate that a revision in age is necessary for a portion of the studied sections. The occurrence of the ammonoids Daxatina and Frankites sutherlandi along with the composition of the conodont assemblages and the presence of bivalves closely related to Daonella elegans McLearn all combine to form the basis for the suggested change in attribution of the lower part of the Middle Member from the Desatoyense Zone to the Sutherlandi Zone.