DV 839-1 [Otuma Fm] (Oligocene of Peru)

Where: Peru (13.9° S, 76.3° W: paleocoordinates 16.1° S, 69.6° W)

• coordinate stated in text

• outcrop-level geographic resolution

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

• Bed of medium-grained sandstone about 2 meters above base of sea cliff. Faulted sandstone beds rest unconformably upon the middle Eocene siltstones. The section consists of three medium beds of indurated bioclastic sandstone near the base seperated by medium-grained sandstone with fossiliferous concretions. The total section may measure about 10 m.

• bed-level stratigraphic resolution

Environment/lithology: marine; medium-grained sandstone

• Medium-grained sandstone

Size class: macrofossils

Preservation: original aragonite, original calcite

Collection methods: quarrying,

• Identifications made by T.J. DeVires. Unknown repository.

Primary reference: T. J. DeViries. 1998. Oligocene deposition and Cenozoic sequence boundaries in the Pisco Basin (Peru). Journal of South American Earth Sciences 11(3):217-231 [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 41621: authorized by Austin Hendy, entered by Austin Hendy on 18.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Probably not complete for locality. Only common and biostratigraphically important taxa listed.
Bivalvia
 Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758 oyster
 Pholadida - Pholadidae
Pholadidae indet. Lamarck 1809 clam
 Cardiida - Veneridae
Veneridae indet. Rafinesque 1815 venus clam
Gastropoda
 Neogastropoda - Buccinidae
? Hanetia sp. Jousseaume 1880 true whelk
 Sorbeoconcha - Turritellidae
"Turritella paracasensis" = Cristispira paracasensis Rivera 1957 turret shell
Turritella lagunillasensis Rivera 1957 turret shell