Cerro Chenque - Chenque Fm: Early/Lower Miocene, Argentina

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Valdesia (Juliana) schucherti
Valdesia (Juliana) aequistriata
Valdesia dalli
Bivalvia - Mytilida - Mytilidae
Lithophaga patagonicus
Modiolus ameghinoi (Ihering 1907)
Bivalvia - Ostreida - Ostreidae
Cubitostrea sp. Sacco 1897
Crassostrea hatcheri (Ihering 1899)
Bivalvia - Ostreida - Pinnidae
Pinna (Atrina) magellanica Ihering 1907
Bivalvia - Pectinida - Pectinidae
"Chlamys" jorgensis (Ihering 1907)
recombined as Chlamys (Zygochlamys) jorgensis
"Chlamys" puntana
Bivalvia - Carditida - Crassatellidae
Crassatella kokeni
Bivalvia - Lucinida - Lucinidae
Pteromyrtea crucialis
Bivalvia - Pholadida - Pholadidae
Pholadidea patagonica (Philippi 1887)
Bivalvia - Cardiida - Cardiidae
"Cardium" puelchum Sowerby 1846
recombined as Trachycardium puelchum
Bivalvia - Cardiida - Veneridae
Ameghinomya argentina Ihering 1897
"Chione" patagonica (Philippi 1887)
"Chione" eupyga Ihering 1907
Retrotapes scutata
Pitar julianum
Bivalvia - Solenida - Solenidae
Solen (Eosolen) crucis
original and current combination Solena (Eosolen)
Gastropoda - Trochidae
Calliostoma garretti
Gastropoda
Peonza torquata Olivera 1994
Gastropoda - Epitoniidae
Cirsotrema rugulosa
Gastropoda - Turritellidae
"Turritella" ambulacrum Sowerby 1846
Gastropoda - Ficidae
Ficus carolina (d'Orbigny 1847)
Gastropoda - Neogastropoda - Buccinidae
"Siphonalia" noachina
Gastropoda - Neogastropoda - Volutidae
"Proscaphella" orbignyana
synonym of Miomelon
"Proscaphella" gracilior (Ihering 1896)
synonym of Miomelon gracilis
Pachycymbiola ameghinoi (Ihering 1896)
Gastropoda - Neogastropoda - Muricidae
Hadriania jorgensis Ihering 1907
Trophon santacrucensis Ihering 1897
Gastropoda - Struthiolariidae
Struthiolarella ornata
Gastropoda - Ranellidae
Austrosassia aff. mathewi
synonym of Sassia
Lotorium usurpator
synonym of Cymatium
"Lotorium" rada
synonym of Cymatium
Gastropoda - Neotaenioglossa - Calyptraeidae
Crepidula gregaria
"Calyptraea" pileus Lamarck 1822
see common names

Geography
Country:Argentina
Coordinates: 45.3° South, 69.0° West (view map)
Paleocoordinates:46.1° South, 62.8° West
Basis of coordinate:based on nearby landmark
Geographic resolution:local area
Time
Period:Neogene Epoch:Miocene
10 m.y. bin:Cenozoic 5
Key time interval:Early/Lower Miocene
Age range of interval:23.03000 - 15.98000 m.y. ago
Stratigraphy
Formation:Chenque
Stratigraphic resolution:group of beds
Stratigraphy comments: STRATIGRAPHIC RELATIONS: From lower beds of the Chenque Fm. THICKNESS: From multiple beds within formation that reaches a thickness of ~100 m. AGE: Early Miocene according to molluscan biostratigraphy. Assigned to the Early Miocene based on the the recognition of the upper JR assemblage (Late Oligocene-Early Miocene). STRATIGRAPHIC POSITION: From six beds, 100 m apart, in the lower part of the formation.
Lithology and environment
Primary lithology: poorly lithified sandstone
Includes fossils?Y
Lithology description: SPECIFIC LITHOLOGY: Sandstone. LITHIFICATION: Poorly-lithified on the basis of figured specimens.
Environment:coastal indet.
Geology comments: ENVIRONMENT: Environmental data not reported in text. Siliciclastic shallow marine assemblage.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection,survey of museum collection
Reason for describing collection:biostratigraphic analysis
Collection method comments: COLLECTOR: List includes both new collections by the author, and examination of museum and previously reported taxa. REPOSITORY: Museo Argentino de Ciencias Naturales Bernadino Rivadavia, Buenos Aires, Argentina.
Taxonomic list comments:COVERAGE: Exhaustive for bivalvia and gastropoda. NOMENCLATURE: Not an authoritaive publication, but providing revised generic placement for many previously reported antiquated names.
Metadata
Database number:71429
Authorizer:A. Hendy Enterer:A. Hendy
Research group:marine invertebrate
Created:2007-04-25 06:49:54 Last modified:2013-11-25 13:37:23
Access level:authorizer only Released:2007-04-25 06:49:52
Creative Commons license:CC BY
Reference information

Primary reference:
12860. C. J. del Rio. 2004. Tertiary Marine Molluscan Assemblages of Eastern Patagonia (Argentina): A Biostratigraphic Analysis. Journal of Paleontology 78(6):1097-1122 [L. Ivany/P. Wall/P. Wall]