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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 36 (1952)

Issue: 9. (September)

First Page: 1766

Last Page: 1776

Title: Lower Cretaceous in Colorado Plateau

Author(s): Wm. Lee Stokes (2)

Abstract:

Fossil collections consisting of non-marine microfossils, plants, and mollusks have recently been made from the Cedar Mountain and Burro Canyon formations of the Colorado Plateau. The containing sediments have previously been considered to be either Jurassic or Late Cretaceous but the fossil evidence indicates early Cretaceous age. The Morrison formation as previously understood should therefore be reduced in thickness and the so-called "Dakota" regarded as consisting, locally at least, of early Cretaceous sediments.

Separation of the Lower Cretaceous beds is difficult if not impracticable in many areas but in others the base is marked by a thin conglomerate which may bridge the Jurassic-Cretaceous time plane.

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