YQ-HJ - upper Monte Leon Fm: Early/Lower Miocene, Argentina

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Reticulochlamys proxima
Lahilla patagonica
Valdesia dalli
Valdesia (Valdesia) diametralis
Gastropoda - Heterostropha - Pyramidellidae
Odostomia suturalis
Odostomia synarthrota
"Turbonilla" eopatagonica
Gastropoda - Lepetellida - Fissurellidae
Lucapinella eurytreta
Gastropoda - Trochidae
Gibbula margaritoides
Calliostoma santacruzense
Calliostoma peraratum
Gastropoda - Solariellidae
Solariella dautzembergi
Gastropoda - Skeneidae
Crossea (Crosseola) pilula
Gastropoda - Opisthobranchia
? Priscaphander patagonica
Gastropoda - Turritellidae
"Turritella" ambulacrum Sowerby 1846
Gastropoda - Neotaenioglossa - Trichotropidae
? Trichosirius patagonica Cossmann 1899
Gastropoda - Neotaenioglossa - Calyptraeidae
Crepidula gregaria
"Calyptraea" pileolus d'Orbigny 1841
recombined as Trochita pileolus
"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" famula
original and current combination Polinices
"Polynices" subtenuis Ihering 1907
recombined as Polinices subtenuis
"Polynices" ortmanni Ihering 1907
Gastropoda - Neogastropoda - Cancellariidae
Admete ameghinoi
Gastropoda - Neogastropoda - Mitridae
Austroimbricaria gracilior (Ihering 1897)
Austroimbricaria quemadensis (Ihering 1897)
Gastropoda - Neogastropoda - Drilliidae
Antimelatoma cuevensis
Antimelatoma quemadensis
Gastropoda - Neogastropoda - Terebridae
Zeacuminia quemadensis
Gastropoda - Neogastropoda - Raphitomidae
"Peratotoma" iheringi Cossmann 1899
Gastropoda - Neogastropoda - Turridae
Eoturris unifascialis
synonym of Eopleurotoma
Gastropoda - Neogastropoda - Volutomitridae
Neoimbricaria patagonica (Ihering 1897)
Gastropoda - Neogastropoda - Volutidae
"Proscaphella" gracilior (Ihering 1896)
synonym of Miomelon gracilis
Gastropoda - Neogastropoda - Muricidae
Xymenella elegans
synonym of Xymene
Trophon santacrucensis Ihering 1897
"Urosalpinx" archipatagonica Ihering 1907
Gastropoda - Struthiolariidae
Struthiolarella ameghinoi (Ihering 1897)
Gastropoda - Ranellidae
"Lotorium" rada
synonym of Cymatium
Gastropoda - Ficidae
Ficus carolina (d'Orbigny 1847)
Gastropoda - Eulimidae
Eulima subventricosa
Bivalvia - Nuculida
Iheringinucula tricesima
Bivalvia - Mytilida - Mytilidae
Modiolus ameghinoi (Ihering 1907)
Bivalvia - Pectinida - Pectinidae
Swiftopecten iheringi
spelled with current rank as Chlamys (Swiftopecten)
Bivalvia - Ostreida - Ostreidae
Crassostrea hatcheri (Ihering 1899)
Ostrea orbignyi
Bivalvia - Arcida - Parallelodontidae
Cucullaria darwini (Philippi 1887)
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)
Bivalvia - Cardiida - Tellinidae
Tellina (Tellina) jeguaensis
Tellinella ? patagonica
spelled with current rank as Tellina (Tellinella)
Bivalvia - Cardiida - Veneridae
Ameghinomya meridionalis Sowerby 1846
Dosinia meridonalis Ihering 1897
Retrotapes striatolamellata
Austrocallista iheringi (Cossmann 1898)
Bivalvia - Cardiida - Mactridae
Mactra darwini
Mactra indistincta
Bivalvia - Pholadida - Pholadidae
Barnea paucispina
Bivalvia - Solenida - Solenidae
Solen (Eosolen) crucis
original and current combination Solena (Eosolen)
Bivalvia - Hiatellida - Hiatellidae
Panopea quemadensis
Bivalvia - Lucinida - Lucinidae
Pteromyrtea crucialis
Bivalvia - Carditida - Crassatellidae
Spissatella longior
Spissatella lyelli
Bivalvia - Carditida - Carditidae
Pleuromeris sp. Conrad 1867
Pleuromeris cannada
see common names

Geography
Country:Argentina
Coordinates: 50.4° South, 69.1° West (view map)
Paleocoordinates:51.1° South, 62.4° 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:71540
Authorizer:A. Hendy Enterer:A. Hendy
Research group:marine invertebrate
Created:2007-04-28 18:12:28 Last modified:2013-11-25 13:37:23
Access level:authorizer only Released:2007-04-28 18:12:27
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]