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Puerto Madryn Autodromo (Miocene of Argentina)

Where: Argentina (42.8° S, 65.1° W: paleocoordinates 43.1° S, 60.9° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Puerto Madryn Formation, Middle Miocene (16.0 - 11.6 Ma)

• The material described herein was obtained in the middle section of the cliffs located to the west of the city of Puerto Madryn. The fossil-bearing beds correspond to accumulations of the Transgressive Phase described by Del río et al. (2001) located in the base of the Puerto Madryn Formation (Fig. 1B). In these levels, Del río et al. (2001) recognized the Glycymerita magna (GROT) Assemblage.

• formation-level stratigraphic resolution

Environment/lithology: open shallow subtidal; sandstone and shale

• The Puerto Madryn Formation consists of a se- quence of coquinas, cross-bedded sandstones, shales with heterolithic lamination, and massive shales to- tally bioturbated or laminated (HAller 1981; Del río 2000). According to scAsso & Del río (1987), the succession belongs to a transgressive-regressive cycle within an overall regressive sequence. These sedi- ments were deposited on a shallow shelf with storm influence, evolving upwards into a tide-dominated es- tuarine environment.

Size class: macrofossils

Reposited in the MLP

Primary reference: C. Acosta Hospitaleche and A. L. Cione. 2012. The most recent record of †Palaeospheniscus bergi Moreno & Mercerat, 1891 (Aves, Spheniscidae) from the middle Miocene, northeastern Patagonia. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen 266(2):143-148 [M. Uhen/M. Uhen] more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 136063: authorized by Mark Uhen, entered by Mark Uhen on 16.11.2012

Creative Commons license: CC BY (attribution)