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
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Barbatia cf. domingensis
(Lamarck 1819)
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recombined as Acar domingensis | |||||||
Bivalvia
- Ostreida
- Ostreidae
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Ostrea cf. intermedoides
Aldrich 1921
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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] |