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Difunta strata of Tertiary age, Coahuila, Mexico

Grover Elmer Murray, James A. Wolleben and Donald Ray Boyd
Difunta strata of Tertiary age, Coahuila, Mexico
Bulletin of the American Association of Petroleum Geologists (October 1959) 43 (10): 2493-2495


The youngest strata of the Difunta group of the Parras basin, southeastern Coahuila and western Nuevo Leon, Mexico, are shown to be of lower Paleocene age by the presence of Cimomia sp. cf. C. haltomi (Aldrich) and Hercoglossa n. sp. aff. H. fricator. However, the bulk of the Difunta beds contain definite Cretaceous fossils. Previous work had uncovered no Tertiary fossils. Field investigations demonstrate a maximum thickness of 11,000 ft. which can be broken down into 2 gross lithic units: 1) marine sand and shale sequence (fossiliferous) and 2) a series of red bed tongues of sands, silts, and shales (unfossiliferous). In general, the structure is a series of E-W-trending anticlines and synclines. The new data indicates that this portion of the Parras basin was: 1) actively negative until sometime in the Paleocene (Midwayan); 2) undergoing continuous deposition from the late Gulfian (Upper Cretaceous) into Paleocene time, spanning the Mesozoic-Cenozoic time boundary; 3) deformed and uplifted sometime between late Paleocene and late Tertiary time.

ISSN: 0883-9247
Serial Title: Bulletin of the American Association of Petroleum Geologists
Serial Volume: 43
Serial Issue: 10
Title: Difunta strata of Tertiary age, Coahuila, Mexico
Pages: 2493-2495
Published: 195910
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
Accession Number: 1959-022181
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
N14°30'00" - N32°43'00", W117°00'00" - W86°45'00"
Source Note: reprinted, in South Texas Geol. Soc., 1959 Field Trip, Dec. 1959, p. C1-C8, illus., 1959.
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1959
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