Pabellon Fm - Molle Alto, Atacama: Late/Upper Aptian, Argentina

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Cephalopoda - Ammonitida - Parahoplitidae
Parahoplites ex gr. nutfieldiensis (Sowerby 1815)
Perez et al. 1990
Bivalvia - Carditida - Crassatellidae
Ptychomya sp.
Perez et al. 1990
Bivalvia - Trigoniida - Myophorellidae
Steinmannella cf. transitoria
Perez et al. 1990
    = Steinmanella cf. transitoria Steinmann 1881
Kiessling 2003
Bivalvia - Trigoniida - Megatrigoniidae
Paulckella covacevichi
Perez et al. 1990
Paulckella nepos (Paulcke 1903)
Bivalvia - Arcida - Cucullaeidae
Idonearca sp. Conrad 1862
Perez et al. 1990
spelled with current rank as Cucullaea (Idonearca)
Bivalvia - Pectinida - Pectinidae
Chlamys cf. discors
Perez et al. 1990
see common names

Geography
Country:Argentina
Coordinates: 27.8° South, 70.3° West (view map)
Paleocoordinates:29.6° South, 38.3° West
Basis of coordinate:stated in text
Geographic resolution:outcrop
Time
Period:Cretaceous Epoch:Early/Lower Cretaceous
10 m.y. bin:Cretaceous 2-3
Key time interval:Late/Upper Aptian
Age range of interval:119.50000 - 113.00000 m.y. ago
Stratigraphy
Formation:Pabellon
Stratigraphic resolution:bed
Stratigraphy comments: AGE: Early Late Aptian based on Parahoplites nutfieldensis. Previous estimates from minimum age of the Pabellon Formation are Late arremian to Aptian based on corals and bivalves (Tavera, 1956) and late Barremian based on presence of Agria blumenbachi (Corvalan, 1974). STRATIGRAPHIC POSITION: From uppermost part of the Parabellon Fm.
Lithology and environment
Includes fossils?Y
Lithology description: SPECIFIC LITHOLOGY: No lithology reported in text. LITHIFICATION: Assumed to be lithified based on figured specimens, which are sometimes free of matrix.
Environment:marine indet.
Glacial or sequence phase:regressive
Geology comments: ENVIRONMENT: Shallow-water. SEQUENCE STRATIGRAPHY: Represents a regressive stage at the end of the Early Cretaceous marine sedimentary cycle in the Andean Basin of Chile and Argentina.
Taphonomy
Modes of preservation:body,replaced with silica
Size of fossils:macrofossils
Preservation of anatomical detail:poor
Collection methods and comments
Collection methods:selective quarrying,field collection
Reason for describing collection:taxonomic analysis
Collection method comments: COLLECTOR: E. Perez d'Angelo (1965). REPOSITORY: Servico Nacional de Geologia y Mineria, Santiago, Chile.
Taxonomic list comments:COVERAGE: Representative, but not exhaustive, for bivalves and cephalopods. Bryozoans, serpulids and gastropods are mentioned as present, but not specified. NOMENCLATURE: Authoritative publication, nomenclature apppears modern for cephalopoda, although possibly antiquated for bivalvia.
Metadata
Database number:64163
Authorizer:A. Hendy, W. Kiessling Enterer:A. Hendy, W. Kiessling
Modifier:A. Hendy Research group:marine invertebrate
Created:2006-09-03 02:24:41 Last modified:2013-11-25 13:37:23
Access level:the public Released:2006-09-03 02:24:41
Creative Commons license:CC BY
Reference information

Primary reference:
18532. M. R. Cooper, E. Perez, and R. Reyes. 1989. The systematic position of Trigonia nepos Paulcke, 1903, and Paulckella, a new genus for the Aptian of Chile. Revista Geologica de Chile 16(1):51-59 [A. Miller/A. Hendy]

Secondary references:

9159 W. Kiessling. 2003. Personal data. [W. Kiessling/W. Kiessling/W. Kiessling]
18531 E. Perez, M.R. Cooper, and V. Covacevich. 1990. Aptian ammonite-based age for the Pabellon Formation, Atacama region, northern Chile. Revista Geologica de Chile 17(2):181-185 [A. Miller/A. Hendy/A. Hendy]