Q-EN-MI - middle Monte Leon Fm: Early/Lower Miocene, Argentina

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Reticulochlamys proxima
Reticulochlamys zinsmeisteri
Fagnanoa dubiosa
Valdesia (Juliana) collaris
Valdesia (Valdesia) diametralis
Valdesia (Valdesia) cuevensis
Sconcia ovolum
Gastropoda - Heterostropha - Pyramidellidae
Odostomia suturalis
Odostomia euryope
Gastropoda - Epitoniidae
Cirsotrema rugulosa
Gastropoda - Turritellidae
"Turritella" ambulacrum Sowerby 1846
Gastropoda - Neotaenioglossa - Calyptraeidae
"Calyptraea" americana
"Calyptraea" pileus Lamarck 1822
Crepidula gregaria
Gastropoda - Ficidae
Ficus carolina (d'Orbigny 1847)
Gastropoda - Ranellidae
Sassia bicegoi
"Sassia" morgani (Ortmann 1900)
Gastropoda - Aporrhaidae
Struthiochenopus santacrucensis
Gastropoda - Struthiolariidae
Struthiolarella ameghinoi (Ihering 1897)
Struthiolarella patagoniensis Camacho and Zinsmeister 1989
Gastropoda - Neogastropoda - Marginellidae
"Marginella" deuterolivella
Gastropoda - Neogastropoda - Volutidae
Adelomelon burmeisteri (Ihering 1907)
"Proscaphella" gracilior (Ihering 1896)
synonym of Miomelon gracilis
"Proscaphella" petersoni
synonym of Miomelon
"Proscaphella" orbignyana
synonym of Miomelon
Gastropoda - Neogastropoda - Muricidae
Trophon santacrucensis Ihering 1897
Xymenella elegans
synonym of Xymene
"Urosalpinx" cossmanni Ortmann 1900
Gastropoda - Neogastropoda - Mitridae
Austroimbricaria gracilior (Ihering 1897)
Austroimbricaria quemadensis (Ihering 1897)
Gastropoda - Neogastropoda - Nassariidae
"Fusus" torosus Ortmann 1902
Gastropoda - Neogastropoda - Buccinidae
Zelandiella ? cossmanni
Penion subrecta
"Siphonalia" ortmanni
Aeneator annae
Gastropoda - Neogastropoda - Drilliidae
Drillia santacrucensis
Gastropoda - Neogastropoda - Mangeliidae
Fusiguraleus pilsbryi
spelled with current rank as Neoguraleus (Fusiguraleus)
Gastropoda - Neogastropoda - Borsoniidae
Borsonia patagonica
Gastropoda - Neogastropoda - Turridae
"Genotia" cruzensis Ihering 1907
Eoturris unifascialis
synonym of Eopleurotoma
Gastropoda - Neogastropoda - Terebridae
Zeacuminia quemadensis
Gastropoda - Neogastropoda - Cancellariidae
? Oamaruia cruzialis
Gastropoda - Neogastropoda - Volutomitridae
Neoimbricaria patagonica (Ihering 1897)
Gastropoda - Naticidae
"Polynices" sanatacrucensis
original and current combination Polinices
"Polynices" secunda
original and current combination Polinices
"Polynices" ortmanni Ihering 1907
"Polynices" consimilis Ihering 1907
"Polynices" subtenuis Ihering 1907
recombined as Polinices subtenuis
Gastropoda - Solariellidae
Solariella dautzembergi
Gastropoda - Turbinidae
Leptothyra philippi
synonym of Collonista
Gastropoda - Trochidae
Calliostoma santacruzense
Calliostoma cossmani
Calliostoma peraratum
Calliostoma garretti
Gastropoda - Lepetellida - Scissurellidae
? Scissurella scotti
Bivalvia - Nuculanida - Malletiidae
Neilo (Neilo) ornata (Sowerby 1846)
Bivalvia - Nuculanida - Nuculanidae
Saccella pueyrredona
Bivalvia - Nuculida - Nuculidae
Lamellinucula reticularis
spelled with current rank as Nucula (Lamellinucula)
Bivalvia - Nuculida
Iheringinucula crassirugata
Bivalvia - Mytilida - Mytilidae
Aulacomya cf. ater (Molina 1782)
recombined as Aulacomya atra
Bivalvia - Mytilida
Modiomytilus pseudochorus
Bivalvia - Ostreida - Ostreidae
Crassostrea hatcheri (Ihering 1899)
Bivalvia - Ostreida - Malleidae
Perna quadrisulcata Ihering 1897
recombined as Isognomon quadrisulcata
Bivalvia - Pectinida - Pectinidae
Zygochlamys geminatus (Sowerby 1846)
recombined as Zygochlamys geminata
Jorgechlamys juliana
"Chlamys" eupatagonica (Ihering 1907)
recombined as Chlamys eupatagonicus
Bivalvia - Arcida - Limopsidae
Limopsis insolita (Sowerby 1846)
Bivalvia - Arcida - Cucullaeidae
Cucullaea (Monteleonia) alta Sowerby 1846
Bivalvia - Arcida - Glycymerididae
Glycymeris (Glycymeris) pseudocuevensis
Bivalvia - Arcida - Parallelodontidae
Cucullaria darwini (Philippi 1887)
Bivalvia - Arcida - Arcidae
Arca patagonica Ihering 1897
recombined as Arca (Arca) patagonica
Bivalvia - Lucinida - Lucinidae
Pteromyrtea crucialis
Bivalvia - Pholadida - Corbulidae
Corbula juliana
Bivalvia - Cardiida - Mactridae
Mactra garreti
Bivalvia - Cardiida - Veneridae
Retrotapes striatolamellata
Ameghinomya argentina Ihering 1897
Ameghinomya meridionalis Sowerby 1846
Dosinia laeviusucula
Dosinia meridonalis Ihering 1897
"Chione" patagonica (Philippi 1887)
Austrocallista iheringi (Cossmann 1898)
Bivalvia - Cardiida - Cardiidae
"Cardium" puelchum Sowerby 1846
recombined as Trachycardium puelchum
Bivalvia - Hiatellida - Hiatellidae
Panopea quemadensis
Panopea regularis (Ortmann 1900)
recombined as Panopea (Panopea) regularis
Bivalvia - Carditida - Crassatellidae
Spissatella longior
Crassatella kokeni
Crassatella patagonica (Ihering 1907)
Bivalvia - Carditida - Carditidae
Pleuromeris sulcolunularis
Pleuromeris sp. Conrad 1867
Pleuromeris camaronesia
Pleuromeris cannada
Pleuromeris cruzensis
see common names

Geography
Country:Argentina
Coordinates: 50.1° South, 68.5° West (view map)
Paleocoordinates:50.9° South, 61.8° 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:Monte Leon Fm
Stratigraphic resolution:group of beds
Stratigraphy comments: STRATIGRAPHIC RELATIONS: From middle beds of the Monte Leon Fm. THICKNESS: From multiple beds within part of formation of around 100 m. AGE: Early Miocene according to molluscan biostratigraphy. Assigned to the early Early Miocene based on the the recognition of the upper RSP assemblage. STRATIGRAPHIC POSITION: From middle part of the formation.
Lithology and environment
Primary lithology:tuffaceous poorly lithified sandstone
Secondary lithology: poorly lithified sandy "limestone"
Includes fossils?Y
Includes fossils?Y
Lithology description: SPECIFIC LITHOLOGY: Sandstone, tuffaceous sandstone, and sandy limestone. 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:71542
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2007-04-28 18:28:24 Last modified:2013-11-25 13:37:23
Access level:authorizer only Released:2008-04-28 18:28:24
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]