Agua Zarca: Early/Lower Albian, Mexico
collected by A. Guzmán-Roa, B. E. Buitrón, V. Páez-Juárez

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda - Heterostropha - Itieriidae
Phaneroptyxis anguillina
Gastropoda - Batillariidae
Pyrazus (Echinobathra) valeriae (de Verneuil and de Loriere 1868)
Gastropoda - Cassiopidae
Gymnentome (Gymnentome) zebra
Mesoglauconia (Mesoglauconia) burnsi
Gastropoda - Purpurinidae
Microschiza (Cloughtonia) scalaris (Conrad in Lynch 1852)
Gastropoda - Naticidae
Natica conradi
Gastropoda
Lunatia pedernalis (Roemer 1852)
original and current combination Natica pedernalis
see common names

Geography
Country:Mexico State/province:Jalisco
Coordinates: 19.8° North, 103.3° West (view map)
Paleocoordinates:19.0° North, 64.2° West
Basis of coordinate:estimated from map
Geographic resolution:small collection
Time
Period:Cretaceous Epoch:Early/Lower Cretaceous
Stage:Albian 10 m.y. bin:Cretaceous 4
Key time interval:Early/Lower Albian
Age range of interval:113.00000 - 109.90000 m.y. ago
Stratigraphy
Formation:Encino
Stratigraphic resolution:group of beds
Stratigraphy comments: apparently "early Albian" based on presence of Coalcomana ramosa in immediately overlying beds; "the base of the sequence [meaning this level] might correspond to the late Aptian" but the fauna includes no species restricted to the Aptian and several found in multiple Albian faunas across the US and Mexico
Lithology and environment
Primary lithology: lithified argillaceous siltstone
Lithology description: "silty layers" that are identified as "argillaceous beds" and illustrated as limestone in a figure; certainly lithified based on figured specimens
Environment:coastal indet.
Geology comments: from "shallow waters" and within a section yielding reefal rudist assemblages
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection,survey of museum collection
Reason for describing collection:taxonomic analysis
Collectors:A. Guzmán-Roa, B. E. Buitrón, V. Páez-Juárez
Collection method comments: IGM collection
Metadata
Database number:115254
Authorizer:J. Alroy Enterer:J. Alroy
Research group:marine invertebrate
Created:2011-08-31 13:46:56 Last modified:2011-08-30 23:46:56
Access level:the public Released:2011-08-31 13:46:56
Creative Commons license:CC BY
Reference information

Primary reference:
37339. B. E. Buitrón-Sánchez and Y. López-Tinajero. 1995. Mollusk gastropods in a Lower Cretaceous rudist-bearing formation of Jalisco, west central Mexico. Revista Mexicana de Ciencias Geológicas 12(2):157-169 [J. Alroy/J. Alroy/P. Wagner]