L-OB-LC - upper Monte Leon Fm: Early/Lower Miocene, Argentina

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Reticulochlamys proxima
Fagnanoa dubiosa
Valdesia (Juliana) aequistriata
Valdesia (Valdesia) cuevensis
Tornatellacea patagonicus
Gastropoda - Heterostropha - Pyramidellidae
"Turbonilla" observationis
"Turbonilla" cuevensis Ihering 1897
Gastropoda - Heterostropha - Acteonidae
Actaeon semilaevis
replaced by Acteon
Gastropoda - Trochidae
Gibbula iheringi
Calliostoma observationis
Gastropoda - Turritellidae
"Turritella" ambulacrum Sowerby 1846
Gastropoda - Neotaenioglossa - Calyptraeidae
Crepidula gregaria
"Calyptraea" pileus Lamarck 1822
Gastropoda - Epitoniidae
Cirsotrema rugulosa
Gastropoda - Naticidae
"Polynices" sanatacrucensis
original and current combination Polinices
"Polynices" secunda
original and current combination Polinices
"Polynices" consimilis Ihering 1907
Gastropoda - Neogastropoda - Cancellariidae
? Oamaruia gracilis
? Oamaruia observatoria
Gastropoda - Neogastropoda - Mitridae
Austroimbricaria quemadensis (Ihering 1897)
Gastropoda - Neogastropoda - Terebridae
Zeacuminia santacrucensis
Gastropoda - Neogastropoda - Volutidae
Pachycymbiola ameghinoi (Ihering 1896)
Pachycymbiola ameghinoi (Ihering 1896)
Gastropoda - Neogastropoda - Muricidae
Xymene dautzembergi
Trophon santacrucensis Ihering 1897
"Urosalpinx" archipatagonica Ihering 1907
Gastropoda - Struthiolariidae
Struthiolarella ameghinoi (Ihering 1897)
Struthiolarella cuevensis Camacho and Zinsmeister 1989
Bivalvia - Nuculanida - Nuculanidae
Pseudoportlandia glabra
Bivalvia - Nuculida - Nuculidae
Lamellinucula lunulae
spelled with current rank as Nucula (Lamellinucula)
Bivalvia - Mytilida - Mytilidae
Modiolus ameghinoi (Ihering 1907)
Lithophaga patagonicus
Bivalvia - Pectinida - Pectinidae
Swiftopecten iheringi
spelled with current rank as Chlamys (Swiftopecten)
Bivalvia - Ostreida - Malleidae
Perna quadrisulcata Ihering 1897
recombined as Isognomon quadrisulcata
Bivalvia - Ostreida - Ostreidae
Crassostrea hatcheri (Ihering 1899)
Bivalvia - Arcida - Cucullaeidae
Cucullaea (Monteleonia) alta Sowerby 1846
Bivalvia - Arcida - Arcidae
Arca patagonica Ihering 1897
recombined as Arca (Arca) patagonica
Bivalvia - Arcida - Glycymerididae
Glycymerita cuevensis
Bivalvia - Arcida - Limopsidae
Limopsis insolita (Sowerby 1846)
Bivalvia - Cardiida - Cardiidae
Hedecardium philippi (Ihering 1897)
"Cardium" puelchum Sowerby 1846
recombined as Trachycardium puelchum
Bivalvia - Cardiida - Tellinidae
Tellina (Tellina) jeguaensis
? Tellinella patagonica
spelled with current rank as Tellina (Tellinella)
Macoma (Macoma) perplana
Bivalvia - Cardiida - Veneridae
Ameghinomya argentina Ihering 1897
Austrocallista iheringi (Cossmann 1898)
Bivalvia - Cardiida - Mactridae
Mactra indistincta
Mactra garreti
Bivalvia - Pholadida - Pholadidae
Pholadidea patagonica (Philippi 1887)
Bivalvia - Lucinida - Lucinidae
Pteromyrtea crucialis
Bivalvia - Carditida - Carditidae
Pleuromeris sp. Conrad 1867
Pleuromeris cannada
see common names

Geography
Country:Argentina
Coordinates: 50.2° South, 68.9° West (view map)
Paleocoordinates:51.0° South, 62.3° 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:Monte Leon Fm
Stratigraphic resolution:group of beds
Stratigraphy comments: STRATIGRAPHIC RELATIONS: From upper beds of the Monte Leon Fm. THICKNESS: From multiple beds within part of formation of less than 60 m. AGE: Early Miocene according to molluscan biostratigraphy. Assigned to the Early Miocene based on the the recognition of the upper PA assemblage. STRATIGRAPHIC POSITION: From uppermost 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:71539
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2007-04-28 18:08:55 Last modified:2013-11-25 13:37:23
Access level:authorizer only Released:2008-04-28 18:08:55
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]