Unit is named the Paradise Ranch Shale Member of the Peace Valley Formation (revised) of the Ridge Basin Group. Is exposed in the central Ridge Basin, Los Angeles Co., CA. Is the lowest member of the Peace Valley, which is separated into five members by clastic tongues of the Ridge Route Formation (revised). Consists of poorly exposed dark-gray, nonfossiliferous shale containing thin interbeds of sandstone. Extends laterally for 5,625 m and interfingers with the Violin Breccia to the southwest and the Ridge Route Formation undivided to the northeast. Conformably overlies the Marple Canyon Sandstone Member (new) and conformably underlies the Fisher Spring Sandstone Member (new), both of the Ridge Route Formation. Thickness is 549 m at the type section. Age is late Miocene based on its stratigraphic position above the marine Castaic Formation and the Marple Canyon Sandstone Member of the Ridge Route Formation. (B1565)

Source: GNU records (USGS DDS-6; Menlo GNULEX).