Abstract by Katelynn Smith
A Geophysical and Geologic Analysis of Regressive-Phase Deposits from Lake Bonneville in Pilot Valley, UT
Pilot Valley, north of West Wendover, NV, contains numerous shorelines and depositional remnants of ancient Lake Bonneville. While lake levels fluctuated due to flooding events, climatic changes were the dominant factor in controlling lake elevation. In Pilot Valley, the paleowind entered from the northwest and circulated clockwise around the basin, as it does today, forming barrier sand bars and v-bars in multiple orientations; v-bars are barriers that formed due to opposing wind directions, creating a v-shaped barrier. On the western side of the valley, a regressive phase (relative sea level fall) sand deposit, dated at 15.0-14.1 cal ka, is hypothesized to have been a barrier during the Provo Shoreline episode. By acquiring Ground Penetrating Radar (GPR), measuring stratigraphic sections and cores, and collecting gastropod samples for radiocarbon dating, we will reconstruct the depositional environment for this deposit and constrain the interpretation of the paleoclimate in Pilot Valley during the later years of Lake Bonneville.