Where: Argentina (50.2° S, 68.9° W)
• Paleocoordinates: 49.6° S, 66.0° W (Wright 2013)
• coordinate based on nearby landmark
• local area-level geographic resolution
When: Monte Leon Fm Formation, Early/Lower Miocene (23.0 - 16.0 Ma)
• 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.
• group of beds-level stratigraphic resolution
Environment/lithology: coastal; poorly lithified sandstone
Size class: macrofossils
Collection methods: 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.
Primary reference: 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]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 71539: authorized by Austin Hendy, entered by Austin Hendy on 28.04.2007
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Gastropoda | |
"Calyptraea" pileus Lamarck 1822 slipper shell
Crepidula gregaria slipper shell | |
"Turritella" ambulacrum Sowerby 1846 turret shell | |
Cirsotrema rugulosa wentletrap | |
? Oamaruia gracilis snail
? Oamaruia observatoria snail | |
Austroimbricaria quemadensis Ihering 1897 mitre shell | |
Zeacuminia santacrucensis auger snail | |
"Urosalpinx" archipatagonica Ihering 1907 murex snail
Xymene dautzembergi murex snail
Trophon santacrucensis Ihering 1897 murex snail | |
Pachycymbiola ameghinoi Ihering 1896 volute | |
Struthiolarella cuevensis Camacho and Zinsmeister 1989 snail
Struthiolarella ameghinoi Ihering 1897 snail | |
""Polynices" sanatacrucensis" = Polinices, ""Polynices" secunda" = Polinices, "Polynices" consimilis
""Polynices" sanatacrucensis" = Polinices moon snail
""Polynices" secunda" = Polinices moon snail
"Polynices" consimilis Ihering 1907 moon snail | |
Gibbula iheringi top snail
Calliostoma observationis top snail | |
"Turbonilla" cuevensis Ihering 1897 snail | |
"Actaeon semilaevis" = Acteon
"Actaeon semilaevis" = Acteon snail | |
Bivalvia | |
Pleuromeris sp. Conrad 1867 clam
Pleuromeris cannada clam | |
Pholadidea patagonica Philippi 1887 clam | |
"? Tellinella patagonica" = Tellina (Tellinella), Tellina (Tellina) jeguaensis, Macoma (Macoma) perplana
"? Tellinella patagonica" = Tellina (Tellinella) tellin clam
Tellina (Tellina) jeguaensis tellin clam
Macoma (Macoma) perplana tellin clam | |
Hedecardium philippi, ""Cardium" puelchum" = Trachycardium puelchum
Hedecardium philippi Ihering 1897 cockle
""Cardium" puelchum" = Trachycardium puelchum Sowerby 1846 cockle | |
Mactra indistincta clam
Mactra garreti clam | |
Ameghinomya argentina Ihering 1897 venus clam
Austrocallista iheringi Cossmann 1898 venus clam | |
Lithophaga patagonicus mussel
Modiolus ameghinoi Ihering 1907 mussel | |
"Perna quadrisulcata" = Isognomon quadrisulcata
"Perna quadrisulcata" = Isognomon quadrisulcata Ihering 1897 oyster | |
Crassostrea hatcheri Ihering 1899 oyster | |
"Swiftopecten iheringi" = Chlamys (Swiftopecten)
"Swiftopecten iheringi" = Chlamys (Swiftopecten) scallop | |
Limopsis insolita Sowerby 1846 clam | |
Cucullaea (Monteleonia) alta Sowerby 1846 clam | |
"Arca patagonica" = Arca (Arca) patagonica
"Arca patagonica" = Arca (Arca) patagonica Ihering 1897 ark | |
Pseudoportlandia glabra pointed nut clam | |
"Lamellinucula lunulae" = Nucula (Lamellinucula)
"Lamellinucula lunulae" = Nucula (Lamellinucula) nut clam |