Roadcut north of Corral (Miocene of Chile)

Where: Valdivia, Chile (39.9° S, 73.4° W: paleocoordinates 40.2° S, 71.1° W)

• coordinate stated in text

When: Santo Domingo Formation, Late/Upper Miocene (11.6 - 5.3 Ma)

• Overlying Formation: Unknown. Underlying Formations: Unconformably overlies the Paleozoic metamorphic rocks of the Bahía Mansa complex. It also overlies the Pupunahue-Catamutún formation, although it is not clear whether the contact with this unit is gradational or if there is a discontinuity, as suggested by the abrupt transition from a coal-bearing unfossiliferous succession to a silty, fossil-rich unit that can be observed in bore holes drilled at the Catamutún mining area southeast of Valdivia. (Alfaro et al., 1990; Elgueta et al., 2000; Feldmann et al., 2010). Thickness: Maximum thickness of the unit at Cuesto Santo Domingo is 110 m, but this must be considered as a minimum estimate because there is no place where a complete section can be measured.

Environment/lithology: submarine fan; gray, sandy siltstone

• The benthic foraminifera assemblage includes both shallow-water and deep-water indicators. The mixed-depth association indicates downslope displacement to lower bathyl depths (2000-4000 m). (Enicnas et al., 2008a).
• It consists in a succession of schist breccia with minor sandstone. The basal breccia is overlain by a succession of dark-gray sandy siltstone, which constitute the most characteristic facies of this unit, and minor sandstone and breccia. Fossils contained within include bivalves, gastropods, brachiopods, bryozoans, crustaceans, echinoids, fishes, foraminifers, ostracodes, radiolarians and leaves (Encinas et al., 2008a).

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 228526: authorized by Joanna Wolfe, entered by Arthur Lynch on 11.12.2022

Creative Commons license: CC BY (attribution)

Taxonomic list

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Malacostraca
 Decapoda - Geryonidae
Chaceon quadrata
Chaceon quadrata Feldmann et al. 2010 crab