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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 27 (1943)

Issue: 3. (March)

First Page: 262

Last Page: 278

Title: Standard of Cretaceous System

Author(s): Siemon Wm. Muller, Hubert G. Schenck

Abstract:

A preliminary report on this subject was read before the Pacific Section of the Association on October 16, 1941. The present paper incorporates slight revisions based on suggestions from several colleagues, notably Gayle Scott, Hans E. Thalmann, and John B. Reeside, Jr., and his associates.

The standard of the Cretaceous system represents a composite time-rock column--a total or complete sequence of strata between the Jurassic and the Cenozoic. This standard has been built up by fitting together continuous sections which are especially well exposed in several areas in Europe. The system is subdivided into series, stages and zones. These divisions are based on paleontologic evidence, with no regard to thicknesses of strata and their lithologic character. Particular attention is drawn to the early work of d'Orbigny in setting up the stages of the entire Cretaceous system. A detailed analysis of a zone clarifies the meaning of this time-stratigraphic term. A study of the boundaries between the underlying Jurassic and the overlying Cenozoic leads to the conclusion that the l west Cretaceous stage is the Berriasian and the highest is the Danian.

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