ammonites

Quebrada la Carrea: Early/Lower Cretaceous, Chile
collected by G. C. Diaz

Where & when
Geology
Taphonomy & methods
Metadata & references
Geography
Country:Chile State/province:Antofagasta
Coordinates: 25.3° South, 69.2° West (view map)
Paleocoordinates:25.5° South, 35.9° West
Basis of coordinate:stated in text
Geographic resolution:small collection
Time
Period:Cretaceous Epoch:Early/Lower Cretaceous
Key time interval:Early/Lower Cretaceous
Age range of interval:145.5 - 99.6 m.y. ago
Stratigraphy
Formation:Santa Ana
Stratigraphy comments: "The age of the outcrop yielding the specimen cannot be determined with precision, due to a lack of diagnostic fossils, but there are arguments suggesting a Late Jurassic to Early Cretaceous age. Marls with concretions at the base of the sequence here are correlated with similar lithologies of Oxfordian age in nearby exposures. An overlying horizon yields abundant fishes, and a sandstone yields remains of the plant Brachyphyllum. Specimens of Williamsonia have been obtained from above the arkoses. Nearby, outcrops of red sandstones overlie marine sediments that yield the bivalves Megatrigonia and Pterotrigonia, which are of Lower Cretaceous age. Thus an Early Cretaceous age is considered more likely than a Late Jurassic one."
Lithology and environment
Primary lithology: lithified carbonaceous sandstone
Includes fossils?Y
Lithology description: "indurated, purple-coloured, poorly sorted, immature polymictic arkose with a carbonate cement"
Environment:coastal indet.
Geology comments: "Coastal environment, probably associated with estuaries"
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Preservation of anatomical detail:medium
Disassociated major elements:all
Collection methods and comments
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Collectors:G. C. Diaz
Metadata
Also known as:Domeykodactylus holotype site
Database number:92228
Authorizer:R. Butler Enterer:R. Butler
Modifier:R. Butler Research group:vertebrate
Created:2009-11-03 08:53:26 Last modified:2009-11-03 09:00:05
Access level:the public Released:2009-11-03 08:53:26
Reference information
Primary reference:
31060 D. M. Martill, E. Frey, G. C. Diaz and C. M. Bell. 2000. Reinterpretation of a Chilean pterosaur and the occurrence of Dsungaripteridae in South America. Geological Magazine 137(1):19-25 [R. Butler/R. Butler]

Secondary references:

31061 R. M. Casamiquela and G. C. Diaz. 1978. La presencia de Pterodaustro Bonaparte (Pterodactyloidea), del Neojurassico (?) de la Argentina, en Los Andes del norte de Chile. Actas del Segundo Congreso Argentino de Paleontologia y Bioestratigrafia y Primer congresso Latinoamericano de Paleontologia 1:201-209 [R. Butler/R. Butler]