Mocha Island (Miocene of Chile)

Where: Arauco (off coast), Chile (38.4° S, 73.9° W: paleocoordinates 39.0° S, 69.9° W)

• coordinate stated in text

When: Ranquil Formation, Miocene (23.0 - 5.3 Ma)

• Overlying Formation: Tubul Formation. Underlying Formation: Lebu Group. Thickness: It is unclear what the thickness is.

Environment/lithology: submarine fan; fine-grained, medium, coarse, calcareous sandstone and fine-grained siltstone

• The Ranquil Formation has mollusk assemblages that show rocky-shore, inner-neritic, and outer-neritic to upper-slope environments, as well as a few deep water. Most were ultimately carried down slope into bathyl depths for deposition. The foraminfera at this locality are representative of lower bathyl depths of 2000-4000 meters (Finger et al, 2007).
• It consists of fine conglomerates, sandstones, siltstones and mudstones (García, 1968) reflecting different environments (Nielsen et al., 2004; Nielsen and Frassinetti, 2007a; Finger et al., 2007; Le Roux et al 2008).

Size class: macrofossils

Primary reference: R. M. Feldmann, C. E. Schweitzer, and A. Encinas. 2010. Neogene Decapod Crustacea from Southern Chile. Annals of Carnegie Museum 78(4):337-366 [J. Wolfe/A. Lynch/A. Lynch]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 228525: authorized by Joanna Wolfe, entered by Arthur Lynch on 11.12.2022

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Malacostraca
 Decapoda - Portunidae
Pheophthalmus mochaensis
Pheophthalmus mochaensis Feldmann et al. 2010 swimming crab