Gran Bajo de San Julian (Miocene to of Argentina)

Where: Argentina (49.5° S, 68.4° W: paleocoordinates 50.3° S, 61.8° W)

• coordinate estimated from map

When: Monte Leon Formation, Aquitanian to Aquitanian (23.0 - 16.0 Ma)

• Age after Parras et al 2008

• formation-level stratigraphic resolution

Environment/lithology: marginal marine; tuffaceous, gray siltstone and tuffaceous, gray sandstone

• light gray tuffaceous siltsones and sandstones

Size class: macrofossils

Preservation: original phosphate

Primary reference: A. L. Cione and M. A. Cozzuol. 1990. Reidentification of Portheus patagonicus Ameghino, 1901, a supposed fish from the Middle Tertiary of Patagonia as a delphinoid cetacean. Journal of Paleontology 64(3):451-453 [M. Uhen/M. Uhen/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 45887: authorized by Mark Uhen, entered by Mark Uhen on 12.12.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Maxillopoda
 Sessilia - Balanidae
Balanus varians1 barnacle
Rhynchonellata
 Terebratulida - Terebratellidae
"Terebratula patagonica" = Terebratella patagonica1
"Terebratula patagonica" = Terebratella patagonica1 Sowerby 1846
Bivalvia
 Pectinida - Pectinoidae
"Pecten geminatus" = Zygochlamys geminata1, "Pecten paranensis" = Aequipecten paranensis1
"Pecten geminatus" = Zygochlamys geminata1 Sowerby 1846 scallop
"Pecten paranensis" = Aequipecten paranensis1 d'Orbigny 1842 scallop
 Ostreida - Ostreidae
"Ostrea patagonica" = Crassostrea patagonica1
"Ostrea patagonica" = Crassostrea patagonica1 d'Orbigny 1842 oyster
Gastropoda
 Ptenoglossa - Epitoniidae
Scalaria rugulosa1 wentletrap
 Neogastropoda - Melongenidae
"Pyrula ? ventricosa" = Melongena (Pyrula)1
"Pyrula ? ventricosa" = Melongena (Pyrula)1 snail
 Neogastropoda - Muricidae
"Fusus patagonicus" = Trophon patagonicus1
"Fusus patagonicus" = Trophon patagonicus1 Sowerby 1846 murex snail
 Stromboidea - Strombidae
"Fusus noachinus" = Rostellaria (Fusus)1
"Fusus noachinus" = Rostellaria (Fusus)1 true conch
 Stromboidea - Struthiolariidae
Struthiolaria ornata1 Sowerby 1846 snail
 Sorbeoconcha - Turritellidae
Turritella ambulacrum1 Sowerby 1846 turret shell
Aves
 Sphenisciformes -
"Pseudospheniscus concavus" = Palaeospheniscus bergi2
"Pseudospheniscus concavus" = Palaeospheniscus bergi2 Moreno and Mercerat 1891 penguin
 Sphenisciformes - Spheniscidae
"Metancylornis curtus" = Paraptenodytes robustus2, "Isotremornis nordenskjoldi" = Paraptenodytes robustus2, "Arthrodytes grandis" = Paraptenodytes robustus2, Paraptenodytes brodkorbi n. sp.3, Arthrodytes andrewsi2
"Metancylornis curtus" = Paraptenodytes robustus2 Ameghino 1894 penguin
"Isotremornis nordenskjoldi" = Paraptenodytes robustus2 Ameghino 1894 penguin
"Arthrodytes grandis" = Paraptenodytes robustus2 Ameghino 1894 penguin
Paraptenodytes brodkorbi n. sp.3 Simpson 1972 penguin
Arthrodytes andrewsi2 Ameghino 1901 penguin
Mammalia
 Odontoceti - Squalodelphinidae
Notocetus vanbenedeni Moreno 1892 toothed whale
 Odontoceti - Kentriodontidae
cf. Kentriodon sp. Kellogg 1927 toothed whale
 Odontoceti -
Prosqualodon australis Lydekker 1894 toothed whale
Echinoidea
 Clypeasteroida - Scutellidae
Scutella innominata1 sand dollar