Where: Sonora, Mexico (30.1° N, 111.7° W: paleocoordinates 13.6° N, 51.2° W)

When: Lower Member (Sierra de Santa Rosa Formation), Late/Upper Sinemurian (196.5 - 189.6 Ma)

Environment/lithology: coastal; lithified sandstone and lithified mudstone

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] more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 115213: authorized by Arnold Miller, entered by Sarah Kolbe on 31.08.2011