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

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda - Naticidae
"Polynices" ortmanni Ihering 1907
Gastropoda - Ficidae
Ficus carolina (d'Orbigny 1847)
Gastropoda - Ranellidae
"Sassia" morgani (Ortmann 1900)
Gastropoda - Struthiolariidae
Struthiolarella patagoniensis Camacho and Zinsmeister 1989
Gastropoda - Aporrhaidae
Gastropoda - Neogastropoda - Marginellidae
Gastropoda - Neogastropoda - Volutidae
Gastropoda - Neogastropoda - Muricidae
Gastropoda - Neogastropoda - Buccinidae
Gastropoda - Neogastropoda - Nassariidae
"Fusus" torosus Ortmann 1902
Gastropoda - Neogastropoda - Cancellariidae
Gastropoda - Neogastropoda - Drilliidae
Gastropoda - Neogastropoda - Borsoniidae
Gastropoda - Neogastropoda - Terebridae
Gastropoda - Neogastropoda - Mangeliidae
Gastropoda - Neogastropoda - Turridae
"Genotia" cruzensis Ihering 1907
Gastropoda - Neogastropoda - Mitridae
Gastropoda - Neogastropoda - Volutomitridae
Gastropoda - Epitoniidae
unclassified
Gastropoda - Neotaenioglossa - Calyptraeidae
"Calyptraea" pileus Lamarck 1822
Gastropoda - Turritellidae
Gastropoda - Heterostropha - Pyramidellidae
Gastropoda - Lepetellida - Scissurellidae
unclassified
Gastropoda - Turbinidae
Gastropoda - Solariellidae
Gastropoda - Trochidae
Bivalvia - Lucinida - Lucinidae
Bivalvia - Pholadida - Corbulidae
Bivalvia - Cardiida - Cardiidae
"Cardium" puelchum Sowerby 1846
Bivalvia - Cardiida - Mactridae
Bivalvia - Cardiida - Veneridae
Austrocallista iheringi (Cossmann 1898)
"Chione" patagonica (Philippi 1887)
Dosinia meridonalis Ihering 1897
Bivalvia - Hiatellida - Hiatellidae
Panopea regularis (Ortmann 1900)
Bivalvia - Carditida - Carditidae
Pleuromeris sp. Conrad 1867
Bivalvia - Carditida - Crassatellidae
Crassatella patagonica (Ihering 1907)
Bivalvia - Mytilida
Bivalvia - Mytilida - Mytilidae
Aulacomya cf. ater (Molina 1782)
Bivalvia - Arcida - Limopsidae
Limopsis insolita (Sowerby 1846)
Bivalvia - Arcida - Glycymerididae
Bivalvia - Arcida - Cucullaeidae
Bivalvia - Arcida - Arcidae
Arca patagonica Ihering 1897
Bivalvia - Arcida - Parallelodontidae
Cucullaria darwini (Philippi 1887)
Bivalvia - Ostreida - Malleidae
Perna quadrisulcata Ihering 1897
Bivalvia - Ostreida - Ostreidae
Crassostrea hatcheri (Ihering 1899)
unclassified
Bivalvia - Pectinida - Pectinidae
Zygochlamys geminatus (Sowerby 1846)
"Chlamys" eupatagonica (Ihering 1907)
Bivalvia - Nuculanida - Nuculanidae
Bivalvia - Nuculanida - Malletiidae
Neilo (Neilo) ornata (Sowerby 1846)
Bivalvia - Nuculida - Nuculidae
Bivalvia - Nuculida
see common names

Geography
Country:Argentina
Coordinates: 50.1° South, 68.5° West (view map)
Paleocoordinates:49.5° South, 65.5° West (Wright 2013)
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 Miocene
Age range of interval: 23.04 - 15.98 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:2025-02-22 15:12:02
Access level:authorizer only Released:2008-04-28 18:28:24
Creative Commons license:CC0
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]