ammonites

Amaral site, Big Bend National Park: Late/Upper Maastrichtian, Texas
collected by W. Langston, Jr.

Where & when
Geology
Taphonomy & methods
Metadata & references
Geography
Country:United States State/province:Texas County:Brewster
Coordinates: 29.3° North, 103.3° West (view map)
Paleocoordinates:35.9° North, 82.6° West
Basis of coordinate:based on nearby landmark
Time
Period:Cretaceous Epoch:Late/Upper Cretaceous
Stage:Maastrichtian 10 m.y. bin:Cretaceous 8
Key time interval:Late/Upper Maastrichtian
Age range of interval:70.6 - 65.5 m.y. ago
Stratigraphy
Formation:Javelina
Stratigraphic resolution:group of beds
Stratigraphy comments: "Bones occur in several concentrations, which are very closely spaced stratigraphically, if not on a single horizon"
Lithology and environment
Primary lithology:gray,green siltstone
Secondary lithology:green,yellow claystone
Includes fossils?Y
Includes fossils?Y
Lithology description: "The surrounding matrix consisted of gray-green siltstone and green to yellow claystone and shale"
Environment:terrestrial indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Preservation of anatomical detail:medium
Associated major elements:all
Disassociated major elements:some
Fragmentation:occasional
Collection methods and comments
Collection methods:field collection,chemical,mechanical
Reason for describing collection:taxonomic analysis
Museum repositories:TMM
Collectors:W. Langston, Jr.
Metadata
Database number:92247
Authorizer:R. Butler Enterer:R. Butler
Modifier:R. Butler Research group:vertebrate
Created:2009-11-04 06:44:49 Last modified:2009-11-04 06:49:17
Access level:the public Released:2009-11-04 06:44:49
Reference information
Primary reference:
31082 A. W. A. Kellner and W. Langston, Jr. 1996. Cranial remains of Quetzalcoatlus (Pterosauria, Azhdarchidae) from Late Cretaceous sediments of Big Bend National Park, Texas. Journal of Vertebrate Paleontology 16(2):222-231 [R. Butler/R. Butler]