View of tectonic blocks in Franciscan mélange can be seen near the Pope Canyon/Berryessa Knoxville Road intersection. It's one of the interpretive stops planned on a Sept. 28 field trip to benefit the Putah Creek Council. Courtesy photo

Eldridge Moores, a distinguished professor emeritus of geology at UC Davis, stands on the Blue Ridge just south of Putah Creek Canyon with outcrops of Great Valley sediments in the background. Courtesy photo