Mx2: La Isleta (Level 2): Bajocian, Mexico

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Cephalopoda - Ammonitida - Stephanoceratidae
Subcollina lucretia (d'Orbigny 1850)
Duashnoceras floresi (Burckhardt 1927)
Duashnoceras paucicostatum (Felix 1891)
Duashnoceras undulatum (Burckhardt 1927)
Cephalopoda - Phylloceratida - Phylloceratidae
Phylloceras sp. Suess 1865
see common names

Geography
Country:Mexico State/province:Oaxaca
Coordinates: 16.8° North, 97.0° West (view map)
Paleocoordinates:8.1° North, 47.2° West
Geographic resolution:small collection
Time
Period: Jurassic Epoch: Middle Jurassic
Stage: Bajocian 10 m.y. bin: Jurassic 4
*Period:Middle Jurassic *Epoch:Dogger
Key time interval: Bajocian
Age range of interval: 170.9 - 168.2 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Taberna
Local section:Mx2 Local bed:2
Local order:bottom to top
Stratigraphic resolution:group of beds
Lithology and environment
Primary lithology:concretionary,ferruginous,gray,red lithified "shale"
Secondary lithology: sandy siltstone
Lithology description: gray or reddish shale with red iron concretions and some beds of siltstone or sandstone.
Environment:offshore
Taphonomy
Modes of preservation:body
Collection methods and comments
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Metadata
Database number:8062
Authorizer:J. Alroy Enterer:M. Sommers
Modifier:E. Leckey Research group:marine invertebrate
Created:2000-06-15 14:44:07 Last modified:2003-07-10 17:49:52
Access level:the public Released:2000-06-15 14:44:07
Creative Commons license:CC BY
Reference information

Primary reference:
539. J. Sandoval and G. E. G. Westermann. 1986. The Bajocian (Jurassic) ammonite fauna of Oaxaca, Mexico. Journal of Paleontology 60(6):1220-1271 [J. Alroy/M. Sommers/O. Alfaro]