YQ-HJ - upper Monte Leon Fm (Miocene of Argentina)

Where: Argentina (50.4° S, 69.1° W: paleocoordinates 51.1° S, 62.4° W)

• 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

• ENVIRONMENT: Environmental data not reported in text. Siliciclastic shallow marine assemblage.
• SPECIFIC LITHOLOGY: Sandstone. LITHIFICATION: Poorly-lithified on the basis of figured specimens.

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 71540: authorized by Austin Hendy, entered by Austin Hendy on 28.04.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for bivalvia and gastropoda. NOMENCLATURE: Not an authoritaive publication, but providing revised generic placement for many previously reported antiquated names.
unclassified
  -
Bivalvia
 Arcida - Arcidae
"Arca patagonica" = Arca (Arca) patagonica
"Arca patagonica" = Arca (Arca) patagonica Ihering 1897 ark
 Arcida - Glycymerididae
"Glycymerita cuevensis" = Glycymeris (Glycymerita)
"Glycymerita cuevensis" = Glycymeris (Glycymerita) clam
 Arcida - Parallelodontidae
Cucullaria darwini Philippi 1887 clam
 Arcida - Cucullaeidae
 Arcida - Limopsidae
Limopsis insolita Sowerby 1846 clam
 Pectinida - Pectinoidae
"Swiftopecten iheringi" = Chlamys (Swiftopecten)
"Swiftopecten iheringi" = Chlamys (Swiftopecten) scallop
 Ostreida - Ostreidae
Crassostrea hatcheri Ihering 1899 oyster
 Mytilida - Mytilidae
Modiolus ameghinoi Ihering 1907 mussel
 Carditida - Crassatellidae
 Carditida - Carditidae
Pleuromeris sp. Conrad 1867 clam
 Pholadida - Pholadidae
 Cardiida - Mactridae
 Cardiida - Veneridae
"Ameghinomya meridionalis" = Leukoma venus clam
Dosinia meridonalis Ihering 1897 venus clam
Austrocallista iheringi Cossmann 1898 venus clam
 Cardiida - Tellinidae
"Tellinella ? patagonica" = Tellina (Tellinella) tellin clam
 Cardiida - Cardiidae
Hedecardium philippi Ihering 1897 cockle
 Hiatellida - Hiatellidae
 Solenida - Solenidae
"Solen (Eosolen) crucis" = Eosolen
"Solen (Eosolen) crucis" = Eosolen clam
 Lucinida - Lucinidae
 Nuculida -
Gastropoda
 Ptenoglossa - Epitoniidae
 Cephalaspida -
 Neogastropoda - Cancellariidae
 Neogastropoda - Mitridae
Austroimbricaria quemadensis Ihering 1897 mitre shell
Austroimbricaria gracilior Ihering 1897 mitre shell
 Neogastropoda - Volutidae
""Proscaphella" gracilior" = Miomelon gracilis
""Proscaphella" gracilior" = Miomelon gracilis Philippi 1887 volute
 Neogastropoda - Muricidae
Trophon santacrucensis Ihering 1897 murex snail
"Xymenella elegans" = Xymene murex snail
"Urosalpinx" archipatagonica Ihering 1907 murex snail
 Neogastropoda - Volutomitridae
Neoimbricaria patagonica Ihering 1897 snail
 Neogastropoda - Drilliidae
 Neogastropoda - Turridae
"Eoturris unifascialis" = Eopleurotoma
"Eoturris unifascialis" = Eopleurotoma turrid
 Neogastropoda - Raphitomidae
"Peratotoma" iheringi Cossmann 1899 snail
 Neogastropoda - Terebridae
 Stromboidea - Struthiolariidae
Struthiolarella ameghinoi Ihering 1897 snail
 Ficoidea - Ficidae
Ficus carolina d'Orbigny 1847 fig shell
 Vanikoroidea - Eulimidae
 Naticoidea - Naticidae
""Polynices" sanatacrucensis" = Polinices, ""Polynices" secunda" = Polinices, ""Polynices" famula" = Polinices, "Polynices" ortmanni, ""Polynices" subtenuis" = Polinices subtenuis
""Polynices" sanatacrucensis" = Polinices moon snail
""Polynices" secunda" = Polinices moon snail
""Polynices" famula" = Polinices moon snail
"Polynices" ortmanni Ihering 1907 moon snail
""Polynices" subtenuis" = Polinices subtenuis Ihering 1907 moon snail
 Calyptraeoidea - Calyptraeidae
"Calyptraea" pileus Lamarck 1822 slipper shell
Crepidula gregaria slipper shell
""Calyptraea" pileolus" = Trochita pileolus d'Orbigny 1841 slipper shell
 Calyptraeoidea - Trichotropidae
? Trichosirius patagonica Cossmann 1899 snail
 Tonnoidea - Ranellidae
""Lotorium" rada" = Cymatium
""Lotorium" rada" = Cymatium triton shell
 Sorbeoconcha - Turritellidae
"Turritella" ambulacrum Sowerby 1846 turret shell
 Pyramidelloidea - Pyramidellidae
 Turbinoidea - Turbinidae
 Fissurelloidea - Fissurellidae
 Trochoidea - Trochidae