Where: Sonora, Mexico (30.7° N, 112.6° W: paleocoordinates 17.6° N, 55.2° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Middle Member (Sierra Santa Rosa Formation), Sinemurian (199.3 - 190.8 Ma)

• Sinemurian-Pliensbachian?

• member-level stratigraphic resolution

Environment/lithology: marine; mudstone and calcareous sandstone

Size class: macrofossils

Preservation: mold/impression

Primary reference: S. E. Damborenea and C. M. González-León. 1997. Late Triassic and Early Jurassic bivalves from Sonora, Mexico. Revista Mexicana de Ciencias Geológicas 14(2):178-201 [M. Aberhan/S. Nurnberg/S. Nurnberg]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 40176: authorized by Martin Aberhan, entered by Sabine Nürnberg on 19.06.2004

Creative Commons license: CC BY (attribution)