EXAMINATION OF BULK SOIL FOR RADIOCARBON DATABLE MATERIAL FROM THE BRIGHAM CITY SEGMENT OF THE WASATCH FAULT, UTAH

A total of 25 bulk soil samples from the three trench sites in the Brigham City segment of the Wasatch Fault zone, Utah, were floated to recover organic fragments suitable for radiocarbon analysis. Botanic components and detrital charcoal were identified, and potentially radiocarbon datable material was separated. The Hansen Canyon, Kotter Canyon, and Pearsons Canyon trench sites lie below the highest Lake Bonneville shoreline. Dating of material from the fault zones will be used to provide time limits for single surface-faulting earthquakes at the Hansen and Pearson sites, as well as two paleoevents at the Kotter site. Samples for AMS radiocarbon dating will be submitted to Woods Hole Institute.