Cutbank exposure near West DuNoir Creek, Wyoming

A cutbank exposure near West DuNoir Creek, Wyoming, illustrates the differences between bedrock and surficial geologic mapping. On bedrock maps this location is mapped as the Eocene (55–34 million years old) Indian Meadows Formation, which corresponds to the bedrock visible in the stream bed. On surficial maps this location is mapped as Pinedale-age (22,000-13,000 years old) glacial till, as seen in the 1.5 m (5 feet) thick package of unsorted sediment in the cutbank. Photo by James Mauch, Wyoming State Geological Survey, on September 13, 2022.