Tiringueo, T 2, San Lucas Formation, Michoacan: Early/Lower Barremian - Late/Upper Barremian, Mexico

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Cephalopoda - Ammonitida - Pulchelliidae
Subpulchellia sp.
1 specimen
Pulchellia sp.
55 specimens
Gerhardtia sp. Hyatt 1903
66 specimens
synonym of Pulchellia (Heinzia)
Cephalopoda - Ammonitida - Ancyloceratidae
"Ancyloceras" vandenheckii Astier 1851
2 specimens
Acrioceras sp. Hyatt 1900
1 specimen
Cephalopoda - Ammonitida - Leptoceratoididae
Hamulinites sp. Paquier 1900
1 specimen
Karsteniceras sp. Royo-Gomez 1945
2 specimens
Cephalopoda - Hamulinidae
Anahamulina sp. Hyatt 1900
8 specimens
see common names

Geography
Country:Mexico
Coordinates: 18.5° North, 100.8° West (view map)
Paleocoordinates:16.8° North, 56.2° West
Basis of coordinate:stated in text
Geographic resolution:small collection
Time
Period:Cretaceous Epoch:Early/Lower Cretaceous
Stage:Barremian 10 m.y. bin:Cretaceous 2
Key time interval:Early/Lower Barremian - Late/Upper Barremian
Age range of interval:130.00000 - 125.45000 m.y. ago
Stratigraphy
Formation:San Lucas Member:Terrero Prieto
Local section:Tiringueo Local bed:T 2
Local order:bottom to top
Stratigraphic resolution:bed
Stratigraphy comments: lower part: Kotetishvilia compressissima zone, middle part: Coronites darsi zone, upper part: "Ancyloceras" vandenheckii zone; Tiringueo Section is a 41.8 m thick unit
Lithology and environment
Primary lithology: lithified "limestone"
Secondary lithology: lithified sandstone
Lithology description: alternation of dark gray marly limestones, yellowish volcanic sandstones and partially covered gray to yellowish marls. Flysch deposit
Environment:submarine fan
Taphonomy
Size of fossils:macrofossils
Preservation of anatomical detail:variable
Collection methods and comments
Collection methods:selective quarrying,field collection
Reason for describing collection:paleoecologic analysis
Metadata
Database number:60782
Authorizer:W. Kiessling Enterer:U. Merkel
Research group:marine invertebrate
Created:2006-05-23 05:27:35 Last modified:2006-05-23 08:27:36
Access level:the public Released:2006-05-23 05:27:35
Creative Commons license:CC BY
Reference information

Primary reference:

17472. R. Barragan, C. Gonzalez-Arreola, and A. B. Villasenor. 2004. Palaeoecological significance of Barremian ammonite assemblages and facies variations from Southwest Mexico. Lethaia 37:223-234 [W. Kiessling/U. Merkel]