Cape Tres Puntas (CPBA Collection) (Oligocene of Argentina)

Where: Santa Cruz, Argentina (47.1° S, 66.1° W: paleocoordinates 48.3° S, 58.2° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: San Julian Formation, Chattian (28.1 - 23.0 Ma)

• The specimens of Peonza n. gen. from the Golfo San Jorge basin were obtained in the shell bed at the top of the San Julian Formation. The San Julián Formation has been variously attributed an early Eocene to early Miocene (Panza et al. 1995, Parras & Casadío 2005), or late Eocene to early Oligocene age based on the microfossil fauna (Bertels 1970, 1975, 1979, Náñez 1990, Náñez et al. 2009, Malumián et al. 1998, Malumián 1999). Recently, 87Sr/86Sr isotopic dating yielded a late Oligocene age (Parras & Casadío 2002, Parras et al. 2012).

• bed-level stratigraphic resolution

Environment/lithology: shoreface; lithified, shelly/skeletal sandstone

• Shoreface based on presence of crossbedding and coarse shelly sandstone
• "Well-cemented shell bed" and medium to coarse fairly consolidated sandstone

Size class: macrofossils

Preservation: coquina, shellbed

Collected by H. Camacho in 1986, 1988

• Repository: Catedra de Paleontologia Collection, Universidad de Buenos Aires (CPBA)

Primary reference: A. M. Olivera, W. J. Zinsmeister, and S. G. Parma. 1994. Peonza: New Gastropod Genus from the Middle Tertiary of Patagonia and Chile. Journal of Paleontology 68(2):279-286 [M. Clapham/B. Santos/B. Santos]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 205658: authorized by Matthew Clapham, entered by Brooke Santos on 18.10.2019

Creative Commons license: CC BY (attribution)

Taxonomic list

Gastropoda
 Ptenoglossa -
Peonza torquata n. gen. n. sp.
Peonza torquata n. gen. n. sp. Olivera 1994 snail
 Cerithioidea - Turritellidae
Turritella sp. Lamarck 1799 turret shell
 Neogastropoda - Muricidae
Trophon sp. Montfort 1810 murex snail
Bivalvia
 Arcida - Cucullaeidae
Cucullaea patagonensis Erdmann and Morra 1985 clam
 Arcida - Limopsidae
Limopsis sp. Sassi 1827 clam
 Pectinida - Limidae
Scaphopoda
 Dentaliida - Dentaliidae
Dentalium sp. Linnaeus 1758 tusk shell
Rhynchonellata
 Rhynchonellida - Notosariidae