Río Foyel Fm - Estancia de Troncoso (Oligocene of Argentina)

Where: Argentina (41.7° S, 71.4° W: paleocoordinates 43.6° S, 63.1° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Rio Foyel Formation, Early/Lower Oligocene (33.9 - 28.4 Ma)

• STRATIGRAPHIC RELATIONS: From Rio Foyel Fm. Unknown stratigraphic relations. THICKNESS: From lower 7 m of 18 m thick section. AGE: Considered to be Late Eocene to Early Oligocene according to foraminiferal, ostracod and microfloral biostratigraphy by Chiesa and Camacho (2001). Griffin et al. (2004) indicated an Early Oligocene age with Sr dates. STRATIGRAPHIC POSITION: From lower part of formation.

• bed-level stratigraphic resolution

Environment/lithology: offshore; lithified, sandy, calcareous shale

• ENVIRONMENT: Offshore, siliciclastic setting.
• SPECIFIC LITHOLOGY: Massive to finely bedded shale with calcareous sandstone beds. LITHIFICATION: Presumably lithified, based on age and facies (concretions and calcarenites

Size class: macrofossils

Collection methods: surface (in situ),

• COLLECTOR: Probably authors (J. Chiesa and H. Camacho). REPOSITORY: Unknown; some described material is reposited at CIRGEO (unknown location).

Primary reference: J. O. Chiesa and H. H. Camacho. 2001. Invertebrados marino Eocenos de la parte de Río Negro, Argentina. Revista Española de Paleontología 16(2):299-316 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 71600: authorized by Austin Hendy, entered by Austin Hendy on 30.04.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE; Exhaustive for brachiopods, bivalves, and gastropods. NOMENCLATURE: Authoritative publication, using fairly modern nomenclature and species-level assignments.
Echinoidea
 Spatangoida - Schizasteridae
Brisaster sp. Gray 1855 heart urchin
Bivalvia
 Nuculanida - Malletiidae
Neilo biradiata Chiesa and Camacho 2001 clam
 Carditida - Carditidae
 Hiatellida - Hiatellidae
Panopea zinsmeisteri n. sp. Chiesa and Camacho 2001 clam
Panopea nucleus Ihering 1899 clam
 Cardiida - Cardiidae
"Loxocardium puelchum" = Trachycardium puelchum, Laevicardium sp.
"Loxocardium puelchum" = Trachycardium puelchum Sowerby 1846 cockle
Laevicardium sp. Swainson 1840 cockle
 Mytilida - Mytilidae
Brachidontes sp. Swainson 1840 mussel
 Arcida - Glycymerididae
Glycymeris cf. ibari Philippi 1887 clam
 Pectinida - Pectinoidae
Zygochlamys sp. Ihering 1907 scallop
 Ostreida - Pinnidae
Pinna sp. Linnaeus 1758 oyster
Gastropoda
 Cerithioidea - Turritellidae
Turritella aff. ambulacrum Sowerby 1846 turret shell
 Sorbeoconcha - Perissityidae
Fusinus patagoniensis n. sp. Chiesa and Camacho 2001 true whelk
 Caenogastropoda - Fasciolariidae
Polinices sp. Monfort 1810 moon snail
Rhynchonellata
 Terebratulida - Terebratellidae
Terebratella sp. d'Orbigny 1847