About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 40 (1956)

Issue: 4. (April)

First Page: 707

Last Page: 721

Title: Stratigraphy of Upper Cretaceous and Tertiary Rocks of Raton Basin, Colorado and New Mexico

Author(s): Ross B. Johnson (2), Gordon H. Wood, Jr. (2)


A thick sequence of late Upper Cretaceous and Tertiary sedimentary rocks is preserved in the Raton basin. These strata include the Pierre shale, Trinidad sandstone, and Vermejo formation of Late Cretaceous age; the Raton formation of Late Cretaceous and Paleocene age; the Poison Canyon formation of Paleocene age; the Cuchara amd Huerfano formations of Eocene age; and two newly defined formations, one probably Oligocene and the other probably Miocene in age. These rocks record some of the stratigraphic and structural events of the Laramide revolution.

In the southern Rocky Mountain region the Laramide revolution began with epeirogenic movements west of the Raton basin in late Montana time. The epeirogenic movements were followed by at least seven orogenic episodes, as shown by angular unconformities and lithologic features of the sedimentary rocks. During the Eocene the sedimentary rocks of the basin were intruded by igneous magma to form sills, dikes, plugs, stocks, sole injections, and laccoliths.

Pay-Per-View Purchase Options

The article is available through a document delivery service. Explain these Purchase Options.

Watermarked PDF Document: $14
Open PDF Document: $24

AAPG Member?

Please login with your Member username and password.

Members of AAPG receive access to the full AAPG Bulletin Archives as part of their membership. For more information, contact the AAPG Membership Department at [email protected].