General Roca 1 (Cretaceous of Argentina)

Where: Rio Negro, Argentina (35.9° S, 69.8° W: paleocoordinates 38.0° S, 57.4° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Jagüel Formation (Malargüe Group), Maastrichtian (72.1 - 66.0 Ma)

• formation-level stratigraphic resolution

Environment/lithology: offshore; lithified, medium, shelly/skeletal siltstone

• Comprised mainly siltstones. From the published stratigraphic section: Shale with fine to medium grained sandstone some planar bedding and oscillation ripples

Size classes: macrofossils, mesofossils

Primary reference: M. Griffin, A. Parras, and S. Casadío. 2008. Late Maastrichtian-Danian Mytilids and Pinnids (Mollusca: Bivalvia) from Northern Patagonia, Argentina. Ameghiniana 45(1):139-152 [J. Sessa/L. Eccles/J. Sessa]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 106100: authorized by Jocelyn Sessa, entered by Laurie Eccles on 02.03.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Bivalvia
 Mytilida - Crenellidae
Gregariella amara n. sp.
Gregariella amara n. sp. Griffin et al. 2008 clam