PM3-Eastern Coahuila(MEX): Valanginian - Berriasian, Mexico

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Ostreida - Gryphaeidae
Exogyra putnami Imlay 1937
Exogyra reedi Imlay 1937
Gastropoda - Vermetidae
Vermetus cornejoi (Castillo and Aguilera 1895)
see common names

Geography
Country:Mexico State/province:Coahuila
Coordinates: 27.0° North, 102.0° West (view map)
Paleocoordinates:23.8° North, 54.3° West
Geographic resolution:small collection
Time
Period: Cretaceous Epoch: Early Cretaceous
Stage: Valanginian - Berriasian 10 m.y. bin: Cretaceous 1
*Epoch:Neocomian
Key time interval: Valanginian - Berriasian
Age range of interval: 139.8 - 139.8 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Geological group:Coahuila Member:Unnamed Shales
Local section:Potrero de Menchaca Local bed:Unnamed Shales
Stratigraphic resolution:group of beds
Lithology and environment
Primary lithology:gray "shale"
Secondary lithology: "limestone"
Geology comments: brown and grey shales and sandy shales with intercalated beds of brownish-grey, even-bedded limestone ranging up to several feet in thickness; weathers brownish-yellow; a marly bed at the base contains the fossils of the collection
Taphonomy
Collection methods and comments
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Metadata
Database number:2150
Authorizer:M. Patzkowsky Enterer:K. Layou
Research group:marine invertebrate
Created:1999-06-23 07:27:40 Last modified:1999-06-23 10:27:40
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]