Q-EN-MI - middle Monte Leon Fm (Miocene of Argentina)

Where: Argentina (50.1° S, 68.5° W: paleocoordinates 50.9° S, 61.8° 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 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.

• group of beds-level stratigraphic resolution

Environment/lithology: coastal; poorly lithified, tuffaceous sandstone and poorly lithified, sandy limestone

• ENVIRONMENT: Environmental data not reported in text. Siliciclastic shallow marine assemblage.
• SPECIFIC LITHOLOGY: Sandstone, tuffaceous sandstone, and sandy limestone. 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 71542: 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
  -
Gastropoda
 Trochoidea - Solariellidae
 Trochoidea - Turbinidae
"Leptothyra philippi" = Collonista
"Leptothyra philippi" = Collonista snail
 Trochoidea - Trochidae
 Lepetellida - Scissurellidae
 Epitonioidea - Epitoniidae
 Neotaenioglossa - Calyptraeidae
Crepidula gregaria slipper shell
"Calyptraea" americana slipper shell
"Calyptraea" pileus Lamarck 1822 slipper shell
 Cerithioidea - Turritellidae
"Turritella" ambulacrum Sowerby 1846 turret shell
 Sorbeoconcha - Aporrhaidae
 Sorbeoconcha - Struthiolariidae
Struthiolarella patagoniensis Camacho and Zinsmeister 1989 snail
Struthiolarella ameghinoi Ihering 1897 snail
 Neogastropoda - Mitridae
Austroimbricaria gracilior Ihering 1897 mitre shell
Austroimbricaria quemadensis Ihering 1897 mitre shell
 Neogastropoda - Buccinidae
 Neogastropoda - Nassariidae
"Fusus" torosus Ortmann 1902 snail
 Neogastropoda - Drilliidae
 Neogastropoda - Borsoniidae
 Neogastropoda - Mangeliidae
"Fusiguraleus pilsbryi" = Neoguraleus (Fusiguraleus)
"Fusiguraleus pilsbryi" = Neoguraleus (Fusiguraleus) snail
 Neogastropoda - Terebridae
 Neogastropoda - Turridae
"Eoturris unifascialis" = Eopleurotoma, "Genotia" cruzensis
"Eoturris unifascialis" = Eopleurotoma turrid
"Genotia" cruzensis Ihering 1907 turrid
 Neogastropoda - Volutomitridae
Neoimbricaria patagonica Ihering 1897 snail
 Neogastropoda - Marginellidae
 Neogastropoda - Muricidae
"Urosalpinx" cossmanni Ortmann 1900 murex snail
"Xymenella elegans" = Xymene murex snail
Trophon santacrucensis Ihering 1897 murex snail
 Neogastropoda - Volutidae
""Proscaphella" petersoni" = Miomelon, ""Proscaphella" orbignyana" = Miomelon, ""Proscaphella" gracilior" = Miomelon gracilis, Adelomelon burmeisteri
""Proscaphella" petersoni" = Miomelon volute
""Proscaphella" orbignyana" = Miomelon volute
""Proscaphella" gracilior" = Miomelon gracilis Philippi 1887 volute
Adelomelon burmeisteri Ihering 1907 volute
 Neogastropoda - Cancellariidae
 Sorbeoconcha - Ficidae
Ficus carolina d'Orbigny 1847 fig shell
 Sorbeoconcha - Ranellidae
Sassia bicegoi triton shell
"Sassia" morgani Ortmann 1900 triton shell
 Sorbeoconcha - Naticidae
""Polynices" sanatacrucensis" = Polinices, ""Polynices" secunda" = Polinices, "Polynices" consimilis, "Polynices" ortmanni, ""Polynices" subtenuis" = Polinices subtenuis
""Polynices" sanatacrucensis" = Polinices moon snail
""Polynices" secunda" = Polinices moon snail
"Polynices" consimilis Ihering 1907 moon snail
"Polynices" ortmanni Ihering 1907 moon snail
""Polynices" subtenuis" = Polinices subtenuis Ihering 1907 moon snail
 Heterostropha - Pyramidellidae
Bivalvia
 Arcida - Parallelodontidae
Cucullaria darwini Philippi 1887 clam
 Arcida - Arcidae
"Arca patagonica" = Arca (Arca) patagonica
"Arca patagonica" = Arca (Arca) patagonica Ihering 1897 ark
 Arcida - Cucullaeidae
 Arcida - Glycymerididae
 Arcida - Limopsidae
Limopsis insolita Sowerby 1846 clam
 Pectinida - Pectinoidae
""Chlamys" eupatagonica" = Chlamys eupatagonicus, Jorgechlamys juliana, "Zygochlamys geminatus" = Zygochlamys geminata
""Chlamys" eupatagonica" = Chlamys eupatagonicus Ihering 1907 scallop
"Zygochlamys geminatus" = Zygochlamys geminata Sowerby 1846 scallop
 Ostreida - Malleidae
"Perna quadrisulcata" = Isognomon quadrisulcata
"Perna quadrisulcata" = Isognomon quadrisulcata Ihering 1897 oyster
 Ostreida - Ostreidae
Crassostrea hatcheri Ihering 1899 oyster
 Mytilida - Mytilidae
"Aulacomya cf. ater" = Aulacomya atra
"Aulacomya cf. ater" = Aulacomya atra Molina 1782 mussel
 Mytilida -
 Lucinida - Lucinidae
 Pholadida - Corbulidae
 Cardiida - Veneridae
Austrocallista iheringi Cossmann 1898 venus clam
Ameghinomya argentina Ihering 1897 venus clam
Ameghinomya meridionalis Sowerby 1846 venus clam
Dosinia meridonalis Ihering 1897 venus clam
"Chione" patagonica Philippi 1887 venus clam
 Cardiida - Mactridae
 Cardiida - Cardiidae
""Cardium" puelchum" = Trachycardium puelchum
""Cardium" puelchum" = Trachycardium puelchum Sowerby 1846 cockle
 Hiatellida - Hiatellidae
"Panopea regularis" = Panopea (Panopea) regularis Ortmann 1900 clam
 Carditida - Carditidae
 Carditida - Crassatellidae
 Nuculida -
 Nuculida - Nuculidae
"Lamellinucula reticularis" = Nucula (Lamellinucula)
"Lamellinucula reticularis" = Nucula (Lamellinucula) nut clam
 Nuculanida - Nuculanidae
Saccella pueyrredona pointed nut clam
 Nuculanida - Malletiidae
Neilo (Neilo) ornata Sowerby 1846 clam