Where: Sonora, Mexico (30.1° N, 111.9° W: paleocoordinates 17.1° N, 50.7° W)

When: Sierra de Santa Roas Formation, Early/Lower Toarcian (183.0 - 182.0 Ma)

Environment/lithology: offshore; lithified, calcareous shale and lithified siltstone

Size class: macrofossils

Preservation: cast, mold/impression

Primary reference: A. Scholz, M. Aberhan, and C.M. León. 2008. Early Jurassic bivalves of the Antimonio terrane (Sonora, NW Mexico): Taxonomy, biogeography, and paleogeographic implications. Geological Society of America Special Paper 442:269-312 [A. Miller/S. Kolbe/P. Wagner]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 115218: authorized by Arnold Miller, entered by Sarah Kolbe on 31.08.2011

Creative Commons license: CC BY (attribution)