[6][7] There are significant archaeological sites documented, including the remains of a large Hill Patwin village occupied around 11,000 years ago.

[1] The Cache Creek area has been and continues to be a popular recreation site for a variety of activities including white-water rafting (called the "wilderness run"), bird watching, hiking, backpacking, fishing and nature photography.

Wildlife species include black-tailed deer, tule elk, wild turkey, quail, rabbit, gray squirrel, dove, pigeon, black bear, raccoon and mountain lion.

This is overlain by unmetamorphized sandstone and shale of Cretaceous age, also of marine origin and also folded and faulted with thick serpentine rock interbedded.

[8] Serpentine rock forms from peridotite that has received intense heat and pressure when down near a subduction zone of Earth's tectonic plates.