Loc. 4 - Punta Alta (Miocene of Chile)

Where: Chile (33.9° S, 71.9° W: paleocoordinates 34.7° S, 66.9° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Navidad Formation, Burdigalian (20.4 - 16.0 Ma)

• STRATIGRAPHIC RELATIONS: From the Navidad Fm, for which lithostratigraphic relationships are not discussed (in english) in text. AGE: The age of the Navidad Formation and equivalent units has been a matter of debate for decades (see Gutiérrez et al. 2013; Finger et al. 2013, and Le Roux et al. 2013; references therein). An early Miocene age for the Navidad Formation was derived from studies on mollusks, shark teeth, Sr isotopes, and radiometric (Ar/Ar and K/Ar) dating of volcanic clasts in this unit (Gutiérrez et al. 2013; Finger et al. 2013; references therein). A middle to late Miocene or early Pliocene age for this unit had been interpreted from the study of foraminifers, ostracodes, pollen, Sr isotopes, and Ar/Ar dating of volcanic clasts (Finger et al. 2013 and references therein). Finger (2013) reexamined planktic foraminifers ascribed to the late Miocene and early Pliocene (in Finger et al. 2007), whereupon they recognized that they were misidentified and reassigned the assemblages to the early Miocene (Burdigalian Stage, ~21–16 Ma). Fossils in the Navidad Formation and correlative units yielded 87Sr/86Sr ages of 24–16 Ma (Nielsen and Glodny 2009). STRATIGRAPHIC POSITION: From unknown position within Navidad Fm.

• group of beds-level stratigraphic resolution

Environment/lithology: submarine fan; poorly lithified siliciclastic sediments

• ENVIRONMENT: Sedimentologic, ichnologic, and paleontologic studies suggest deposition at bathyal depths for part of the Navidad Formation and correlative units (Osorio and Elgueta 1990; Antinao 2000; Finger et al. 2007; Encinas et al. 2008, 2012). Many of the mollusks are redeposited shallow-water species.
• SPECIFIC LITHOLOGY: Interbedded sandstone and mudstone. LITHIFICATION: Poorly lithified to lithified, based on outcrop photos.

Size class: macrofossils

Collected by Covacevich & Frassinetti

Collection methods: surface (in situ),

• COLLECTOR: Presumably V. Covacevich and D. Frassinetti. R, prior to 1980. REPOSITORY: SGO.

Primary reference: V. Covacevich and D. Frassinetti. 1986. El genero Cancellaria en el Mioceno de Chile con descripcion de cuatro especies nuevas (Gaastropoda: Cancellariidae). Revista Geológica de Chile 28-29:33-67 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 78524: authorized by Austin Hendy, entered by Austin Hendy on 07.02.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for bivalvia and gastropoda. NOMENCLATURE: Authoritative publication, and with taxonomic assignments to species and subgenus resolution.
Anthozoa
 Scleractinia - Flabellidae
Flabellum costatum stony coral
Bivalvia
 Nuculanida - Sareptidae
Portlandia sp. Mörch 1857 clam
 Nuculanida - Malletiidae
 Nuculanida - Nuculanidae
Nuculana (Sacella) sp., "Nuculana (Poroleda) sp." = Poroleda
Nuculana (Sacella) sp. Link 1807 pointed nut clam
"Nuculana (Poroleda) sp." = Poroleda Hutton 1893 pointed nut clam
 Nuculida - Nuculidae
"Nucula (Leionucula) lebuensis" = Leionucula
"Nucula (Leionucula) lebuensis" = Leionucula nut clam
 Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758 oyster
 Arcida - Limopsidae
Limopsis (Limopsis) sp. Sassi 1827 clam
 Arcida - Glycymerididae
Glycymeris sp. Da Costa 1778 clam
 Hiatellida - Hiatellidae
 Cardiida - Cardiidae
 Cardiida - Tellinidae
Tellina araucana tellin clam
Tellina sp. Linnaeus 1758 tellin clam
 Cardiida - Anatinellidae
 Pholadida - Corbulidae
Caryocorbula sp. Gardner 1926 clam
 Lucinida - Lucinidae
Lucinoma promaucana Philippi 1877 clam
Scaphopoda
 Dentaliida - Dentaliidae
Dentalium majus tusk shell
Dentalium sulcosum tusk shell
Gastropoda
 Opisthobranchia - Cylichnidae
Scaphander sp. Monfort 1810 snail
 Opisthobranchia - Bullidae
"Bulla" sp. Linnaeus 1758 snail
 Heterostropha - Architectonicidae
"Architectonica (Discotectonica) navidadensis" = Discotectonica
"Architectonica (Discotectonica) navidadensis" = Discotectonica snail
 Heterostropha - Pyramidellidae
Turbonilla acicula Holmes 1859 snail
 Sorbeoconcha - Aporrhaidae
Hemichenopus araucanus Phillippi 1887 snail
 Neogastropoda - Volutidae
"Proscaphella triplicata" = Palaeomelon triplicata, "Proscaphella cf. domeykoana" = Palaeomelon domeykoana
"Proscaphella triplicata" = Palaeomelon triplicata Sowerby 1846 volute
"Proscaphella cf. domeykoana" = Palaeomelon domeykoana Philippi 1887 volute
 Neogastropoda - Cancellariidae
Cancellaria medinae Philippi 1887 snail
 Neogastropoda - Clavatulidae
"Turricula (Surcula) sp." = Turricula
"Turricula (Surcula) sp." = Turricula Schumacher 1817 snail
 Neogastropoda - Borsoniidae
? Borsonella sp. Dall 1908 snail
 Neogastropoda - Terebridae
Terebra undulifera auger snail
 Neogastropoda - Turridae
"Pleurotoma lanceolata" = Turris, Gemmula subaequalis, Gemmula discors
"Pleurotoma lanceolata" = Turris turrid
 Neogastropoda - Buccinidae
"Siphonalia subreflexa" = Austrosipho subreflexa, Siphonalia domeykoana
"Siphonalia subreflexa" = Austrosipho subreflexa Sowerby 1844 true whelk
 Sorbeoconcha - Cassidae
 Sorbeoconcha - Personidae
"Distorsio (Rhysema) thersites" = Distorsio ringens
"Distorsio (Rhysema) thersites" = Distorsio ringens Philippi 1887 snail
 Sorbeoconcha - Naticidae
Sinum cf. pullus moon snail
Polinices medinae moon snail
 Cerithioidea - Turritellidae
"Turritella trilirata" = Incatella trilirata, Turritella sp.
"Turritella trilirata" = Incatella trilirata Philippi 1887 turret shell
Turritella sp. Lamarck 1799 turret shell
 Trochoidea - Solariellidae
Solariella sp. Wood 1842 snail
Cephalopoda
 Nautilida - Aturiidae
Aturia sp. Bronn 1838 nautiloid