USGS 13539 - Nuevo Leon, Mexico (Lower Marine Sandstone, Oligocene): Early/Lower Oligocene, Mexico
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Pholadida
- Corbulidae
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Corbula (? Erodona) carlotae
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Corbula (Caryocorbula) engonata
Conrad 1848
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Gastropoda
- Ampullinidae
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Ampullina mississippiensis
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Gastropoda
- Ficidae
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Ficus mississippiensis
Conrad 1848
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Gastropoda
- Neogastropoda
- Conidae
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Conus (Leptoconus) alveatus
Conrad 1865
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| synonym of Conus sauridens | ||||||||||
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Gastropoda
- Neogastropoda
- Olivellidae
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Oliva mississippiensis
Conrad 1848
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| recombined as Agaronia mississippiensis | ||||||||||
| Subspecies: Oliva mississippiensis santander | ||||||||||
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Gastropoda
- Neogastropoda
- Muricidae
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Typhis curvirostratus
Conrad 1848
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| recombined as Siphonochelus (Laevityphis) curvirostratus | ||||||||||
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Murex (Murex) mississippiensis
Conrad 1848
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Gastropoda
- Naticidae
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Sinum mississippiense
Conrad 1848
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Gastropoda
- Thiaridae
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Hemisinus miralejas
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Hemisinus siliceus
Brown and Pilsbry 1914
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| Hemisinus siliceus mexicanus | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Mexico | State/province: | Nuevo Leon |
| Coordinates: | 25.8° North, 99.2° West (view map) | ||
| Paleocoordinates: | 26.6° North, 93.1° West | ||
| Basis of coordinate: | based on nearby landmark | ||
| Geographic resolution: | outcrop |
Time
| Period: | Paleogene | Epoch: | Oligocene |
| Stage: | Rupelian | 10 m.y. bin: | Cenozoic 4 |
| Key time interval: | Early/Lower Oligocene | ||
| Age range of interval: | 33.90000 - 27.82000 m.y. ago |
Stratigraphy
| Member: | Upper marine sandstone | ||||
| Local section: | Rancho Miralejas | ||||
| Regional section: | Nuevo Leon | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Lower Oligocene age faunas in notheastern Mexico are closely allied to the Chickasawhay and Suwanee limestones of the eastern Gulf Coast. They are recognised in a lower marine sandstone, presumably of lower Oligocene age, and in an upper marine sandstone, presumably of middle Oligocene age. The marine beds are separated by non-maine sediments, typically red and green bentonitic clays. The Oligocene series in Mexico is measured in thousands of feet, although the fauna is only known from a few isolated outcrops. | |||||
Lithology and environment
| Primary lithology: | brown claystone |
| Includes fossils? | Y |
| Lithology description: Brown weathering clays. | |
| Environment: | coastal indet. |
| Geology comments: Siliciclastic. 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 13539 | ||
| Database number: | 43083 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2004-08-10 09:26:23 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | the public | Released: | 2004-08-10 09:26:23 |
| 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] |