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GEOREF RECORD

Upper Cretaceous stratigraphy and paleontology, lower Tres Hermanos Sandstone, Sevilleta Grant near La Joya, Socorro County, New Mexico

Bruce Baker and Donald L. Wolberg
Upper Cretaceous stratigraphy and paleontology, lower Tres Hermanos Sandstone, Sevilleta Grant near La Joya, Socorro County, New Mexico (in Association round table; Rocky Mountain Section, AAPG; abstracts of papers, Anonymous)
AAPG Bulletin (March 1981) 65 (3): 554

Abstract

More than 1,300 ft (396 m) of Upper Cretaceous rocks overlie shales of the Upper Triassic Dockum Formation and are exposed on the Sevilleta Grant, near La Joya, Socorro County, New Mexico. The Upper Cretaceous sequence extends from the Dakota Sandstone to the Dilco Member of the Crevasse Canyon Formation and consists largely of shales and sandstones. The included Tres Hermanos Sandstone Member of the Mancos Shale includes sandstones, shales, and two coal beds. The lowermost sandstone unit is a moderately sorted, calcareous sandstone which coarsens upward and with small- and medium-scale tangential, wedge and trough-shaped sets of cross-beds. The sandstone is about 11 ft (3.4 m) thick and contains fossil-rich lenses of poorly sorted, dark yellow-brown-weathering sands that are friable to moderately indurated and calcite cemented. Shale galls are present in the fossil-rich lenses and, together with wood fragments, abundant turtle bone fragments, some crocodile tooth and scute fragments, amid vertebrae and teeth, indicate a nearshore environment with a nearby source of freshwater. Selachian teeth and probable coprolites are richly varied and abundant. The following genera have been recognized: Hybodus, Lonchidion, Squalicorax, Squatina, Brachaelurus, Scapanorhynchus, Odontaspis, Cretoxyrhina, Cretolamna, Plicatolamna, Paranomotodon, Ischyrhiza, Ptychotrygon, Rhombodus as well as several as yet indeterminate genera. The dominant invertebrate genus is the oyster Crassostrea soleniscus although at least two genera of gastropods are present.


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 65
Serial Issue: 3
Title: Upper Cretaceous stratigraphy and paleontology, lower Tres Hermanos Sandstone, Sevilleta Grant near La Joya, Socorro County, New Mexico
Title: Association round table; Rocky Mountain Section, AAPG; abstracts of papers
Author(s): Baker, BruceWolberg, Donald L.
Author(s): Anonymous
Affiliation: New Mexico Bureau of Mines and Mineral Resources, Socorro, NM, United States
Pages: 554
Published: 198103
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
Meeting name: Association round table; Rocky Mountain Section, AAPG
Meeting location: Albuquerque, NM, USA, United States
Meeting date: 19810412April 12-15, 1981
Summary: Y
Accession Number: 2001-014816
Categories: Stratigraphy
Document Type: Serial Conference document
Bibliographic Level: Analytic
N33°25'00" - N34°34'60", W107°42'00" - W105°55'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute.
Update Code: 200106
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