Where: Chubut, Argentina (42.6° S, 64.3° W: paleocoordinates 42.8° S, 61.6° W)

• coordinate stated in text

When: Puerto Madryn Formation, Tortonian (11.6 - 7.2 Ma)

• More recently Scasso et al. (2001) used 87Sr/86Sr dating to refer the Puerto Madryn Formation to the earliest late Miocene (middle Tortonian, 10 ± 0.3 Ma). These values are close to those reported by Zinsmeister et al. (1981), who published a 40K/40Ar age of 9.4 Ma for the uppermost beds of this unit.

Environment/lithology: offshore ramp; lithified, fine-grained sandstone and lithified mudstone

Size classes: macrofossils, microfossils

Preservation: trace, original aragonite, original chitin

Reposited in the USNM

Collection methods: surface (in situ), mechanical,

• MPEF-PI: Museo Paleontologico Egidio Feruglio, Trelew, Chubut, Argentina

Primary reference: S. Casadio, R. M. Feldmann, A. Parras and C. E. Schweitzer. 2005. Miocene fossil Decapoda (Crustacea: Brachyura) from Patagonia, Argentina, and their paleoecological setting. Annals of Carnegie Museum 74(3):151-188 [C. Schweitzer/C. Schweitzer]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 56992: authorized by Carrie Schweitzer, entered by Carrie Schweitzer on 30.11.2005

Creative Commons license: CC BY (attribution)