Sedimentary rocks of Cretaceous age exposed along the Pacific Coast south of Pescadero Point, California, were originally assigned to the Chico formation by Branner, Arnold, and Newsom (1909). However, application of this term to beds lithologically different, located nearly 200 miles from the type locality of the Chico formation, is unwarranted in the absence of established continuity between the two sections.

Since proposal of the name Chico by Gabb (1869, pp. xii, xiv, 129 footnote) for strata exposed on Chico Creek, northern California, use of this term was gradually extended until all Upper Cretaceous rocks in California, Oregon, and...

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