Type section; exposures on Cortina Ridge, Wilbur Springs quad, Colusa Co, CA. Contains Venado Sandstone Member at base and Sites Sandstone Member. Consists of olive and gray sandstone, siltstone, and mudstone. Thickness is 2,900 m. Is thin- to thick-bedded; coarse-grained; mixed plutonic and volcanic detritus deposited in deep-marine trough. Conformably overlies or intertongues with Boxer Formation; underlies Rumsey Formation. Is Late Cretaceous age.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
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