The Kreyenhagen Formation

The Kreyenhagen Formation is an Middle to Upper Eocene-age geologic unit in the San Joaquin Valley. Included in the Kreyenhagen are organic-rich shales that source some of the oils produced in the valley.

Outcrops of the Point of Rocks Sandstone (lowstand fan deposits) imbedded in gray, deep-marine shales of the Kreyenhagen Fm.