Talus slope on Mission Peak, Alameda County, California

A talus slope on Mission Peak near Fremont (Alemeda County). The blocky slope consists of materials that accumulated from rockfalls at the base of a steeply dipping hogback of sedimentary rocks (Briones Formation, Late Miocene, about 12 to 8 million years old). The abundance of grass amongst the boulders suggests that slope is now relatively stable compared to perhaps an earlier period.

The URL of this page is http://3dparks.wr.usgs.gov/landslide/big/4.htm