Cerro Organos (Eocene of Peru)

Where: Peru (4.2° S, 81.2° W: paleocoordinates 12.1° S, 109.7° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Terebratula Formation, Bartonian (41.3 - 38.0 Ma)

• "Lomitos sandstone". The basal shallow-water unit of the Talara shale group is the Terebratula sandstone and its southern equivalent, the Lomitos conglomerate (also known as the "Orthophragmina sand").

• bed-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; bioturbated, silty shale

• According to Fildani et al. (2008): "The Terebratula Formation is characterized by 2- to 3-m-thick cross-bedded sandstone beds with pebble- and shell-filled scoured bases. Conglomerate beds are also present. Coquina beds contain common brachiopods (terebratulidi) and Turritellae. Upsection, pervasively bioturbated shaly siltstone becomes predominant with interbedded cross-bedded thin layers of pebbly sandstone and shells. This formation is interpreted to reflect progressive deepening from foreshore to outer shelf depositional environments." Nautilids are indicated as occurring in the silty shales, indicating an offshore-transition environment.

Size class: macrofossils

Preservation: mold/impression

Collected by Pedro Verastegui; reposited in the SUI

Primary reference: A. K. Miller and H. R. Downs. 1950. Tertiary nautiloids of the Americas: supplement. Journal of Paleontology 24:1-18 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 180403: authorized by Matthew Clapham, entered by Matthew Clapham on 15.07.2016

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Nautilida - Aturiidae
Aturia peruviana
Aturia peruviana Olsson 1928
 Nautilida - Hercoglossidae
Deltoidonautilus haughti