Excerpt from Proceedings of the California Academy of Sciences, Vol. 2: Cretaceous Deposits of the Pacific Coast

Northward in California, and in Southern Oregon, the Cretaceous beds are restricted to the larger valleys lying among the Klamath Mountains or upon their eastern out skirts, and here, also, they rest upon the older crystalline or metamorphic rocks, and are overlaid by Tertiary or Neocene deposits largely of fresh-water origin, or by Neocene lavas.

Within the boundaries of the Great Basin, the only Cretaceous rocks that have been reported rest in a similar manner upon a complex of early Mesozoic and older rocks.

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