USGS 13475 - Tamaulipas, Mexico (Upper Indio Formation): Early/Lower Eocene, Mexico

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Arcida - Arcidae
Barbatia cf. domingensis (Lamarck 1819)
recombined as Acar domingensis
Bivalvia - Ostreida - Ostreidae
Ostrea cf. intermedoides Aldrich 1921
recombined as Ostrea (Ostrea) intermedoides
see common names

Geography
Country:Mexico State/province:Tamaulipas
Coordinates: 26.4° North, 99.2° West (view map)
Paleocoordinates:30.1° North, 85.8° West
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period:Paleogene Epoch:Eocene
Stage:Ypresian 10 m.y. bin:Cenozoic 2
Key time interval:Early/Lower Eocene
Age range of interval:55.80000 - 48.60000 m.y. ago
Stratigraphy
Geological group:Wilcox Formation:Indio Member:Upper
Stratigraphic resolution:bed
Stratigraphy comments: The Indio Formation of south Texas, characterised by play or slabby sandstones and thin-bedded sandy shale and clay, is rpesent in Mexico, with an estimated thickness of more than 3000 ft. The Indio Formation shows faunal similarity with the Tuscahoma and Bashi Formations of Alabama. The Indio Formation is subdivided into three members. The collection is derived from the upper member. Upper member of the Indio Formation is as a rule an indurated gray-blue calcareous sandstone, rather fine-grained, micaceous, and commonly jointed or cross-bedded. The collection however comes from a 0.5-8 inch oyster bed.
Lithology and environment
Primary lithology:concretionary,pebbly,shelly/skeletal,red or brown lithified conglomerate
Includes fossils?Y
Lithology description: From brecciated oyster bed associated with a conglomerate of large brown and reddish-brown pebbles and broken discoidal concretions, probably reworked from lower shales.
Environment:coastal indet.
Geology comments: Siliciclastic, probably very shallow water given oysters and conglomerate. No paleoenvironmental data reported.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:selective quarrying,field collection
Reason for describing collection:taxonomic analysis
Museum repositories:USNM
Collection method comments: Collections reposited in USGS and USNM collections.
Taxonomic list comments:Exhaustive for mollusca.
Metadata
Also known as:USGS 13475
Database number:42932
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2004-08-07 05:32:11 Last modified:2013-11-25 13:37:23
Access level:the public Released:2004-08-07 05:32:11
Creative Commons license:CC BY
Reference information

Primary reference:

7474. J. Gardner. 1945. Mollusca of the Tertiary formations of Northeastern Mexico. Geological Society of American Memoir 11 [M. Kosnik/M. Kosnik/M. Kosnik]