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The AAPG/Datapages Combined Publications Database
Four Corners Geological Society
Abstract
The Dakota Sandstone and Mancos Shale in the Laguna-Acoma-Grants Area, New Mexico
Abstract
The generally transgressive rock sequence that constitutes the lower part of the Cretaceous System in west-central New Mexico — the intertongued Dakota Sandstone and Mancos Shale — is here divided into named formal and informal rock units of regional significance. The formally named rock units are developed in fullest degree in the Laguna area where they comprise, in descending order, the Twowells Sandstone Tongue of the Dakota Sandstone, the Whitewater Arroyo Shale Tongue of the Mancos Shale, the Paguate Sandstone Tongue of the Dakota Sandstone, the Clay Mesa Shale Tongue of the Mancos Shale, the Cubero Sandstone Tongue of the Dakota Sandstone, and the Oak Canyon Member of the Dakota Sandstone which can be informally divided into distinctive upper and lower parts. Eastward and southward from Laguna most of the sequence is included in the marine Mancos Shale. Westward and northwestward from Laguna most of the sequence is included in the fluviatile and paralic Dakota Sandstone.
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