PM2-Eastern Coahuila: Valanginian, Mexico
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Ostreida
- Gryphaeidae
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Exogyra reedi
Imlay 1937
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Exogyra putnami
Imlay 1937
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| synonym of Aetostreon subsinuatum | |||||||
| see common names | |||||||
Geography
| Country: | Mexico | State/province: | Coahuila |
| Coordinates: | 27.0° North, 102.0° West (view map) | ||
| Paleocoordinates: | 24.3° North, 54.7° West | ||
| Geographic resolution: | small collection |
Time
| Period: | Cretaceous | Epoch: | Early/Lower Cretaceous |
| Stage: | Valanginian | 10 m.y. bin: | Cretaceous 1 | *Epoch: | Neocomian |
| Key time interval: | Valanginian | ||
| Age range of interval: | 139.80000 - 132.60000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Geological group: | Coahuila | Member: | Menchaca Limestone |
| Local section: | Potrero de Menchaca | Local bed: | Menchaca Limestone |
| Stratigraphic resolution: | group of beds |
Lithology and environment
| Primary lithology: | "limestone" |
| Geology comments: dk. blue-black limestone in beds averaging 18 inches in thickness, the lower part contains white calcite replaced Exogyras, namely E. reedi and E. putnami | |
Taphonomy
| Modes of preservation: | replaced with calcite |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis |
Metadata
| Database number: | 2149 | ||
| Authorizer: | M. Patzkowsky | Enterer: | K. Layou | Research group: | marine invertebrate |
| Created: | 1999-06-23 07:17:51 | Last modified: | 1999-06-23 10:17:51 |
| Access level: | the public | Released: | 2000-11-20 13:53:14 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 65. | R. W. Imlay. 1940. Neocomian Faunas of Northern Mexico. Geological Society America Bulletin 51(1):117-190 [M. Patzkowsky/K. Layou/A. Clement] |