Arroyo de Los Sauces ASI-2: Pennsylvanian, Mexico

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Bryozoa indet.
Brachiopoda indet.
Trilobita indet.
Bivalvia
Bivalvia indet. Linnaeus 1758
Bivalvia - Ostreida - Pterineidae
Leptodesma (Leptodesma) sp. Hall 1883
Bivalvia - Pectinida - Euchondriidae
Euchondria sp. Meek 1874
Bivalvia - Pectinida - Aviculopectinidae
Aviculopecten cf. basilicus Newell 1938
Bivalvia - Myalinida - Myalinidae
Myalina meeki Dunbar 1924
recombined as Myalinella meeki
Bivalvia - Cardiida - Kalenteridae
Permophorus spinulosa
Bivalvia - Pholadomyida - Edmondiidae
Edmondia ovata Meek and Worthen 1873
Bivalvia - Grammysiidae
Ectogrammysia prolata Hoare 1993
Bivalvia - Trigoniida - Schizodidae
Schizodus cf. ulrichi Worthen 1890
Crinoidea
Crinoidea indet. Miller 1821
see common names

Geography
Country:Mexico State/province:Oaxaca
Coordinates: 17.5° North, 97.1° West (view map)
Paleocoordinates:15.2° South, 49.9° West
Basis of coordinate:stated in text
Time
Period:Carboniferous Epoch:Pennsylvanian
10 m.y. bin:Carboniferous 4-5
Key time interval:Pennsylvanian
Age range of interval:323.20000 - 298.90000 m.y. ago
Stratigraphy
Formation:Ixtaltepec
Stratigraphy comments: bivalves allow a tentative age assignment that ranges from Morrowan to Desmoinesian
Lithology and environment
Primary lithology:gray "shale"
Includes fossils?Y
Lithology description: gray shale that turns brown and yellow when weathered; at 230 m above the base of the column; API-4 to API-8 and ASI-1 to ASI-2: argillaceous unit with greater diversity of bivalves
Environment:offshore indet.
Geology comments: Ixtaltepec: marine sequence composed of shale, mudstone, and sandstone, interbedded with limestone lenses; API-4 to API-8 and ASI-1 to ASI-2: highly diverse fauna indicates shallow, well oxygenated environment with abundant nutrients located in the tropical to subtropical zone
Taphonomy
Modes of preservation:mold/impression
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Metadata
Database number:211814
Authorizer:B. Seuss Enterer:B. Seuss
Modifier:B. Seuss Research group:marine invertebrate
Created:2020-07-28 11:30:31 Last modified:2022-02-23 04:44:17
Access level:the public Released:2020-07-28 11:30:31
Creative Commons license:CC BY
Reference information

Primary reference:
78872. S.A. Quiroz-Barroso and M. del Carmen Perrilliat. 1998. Pennsylvanian Bivalves from the Ixtaltepec Formation, Mexico. Journal of Paleontology 72(6):1011-1024 [B. Seuss/B. Seuss]