Where: Baja California, Mexico (31.5° N, 116.7° W: paleocoordinates 30.0° N, 67.3° W)

• small collection-level geographic resolution

When: lower Member (Alisitos Formation), Late/Upper Aptian (122.5 - 112.0 Ma)

• Age: "Aptian to middle Albian." Squires and Saul (2004) confirming and following Allison (1974) place this collection in the Late Aptian.

• bed-level stratigraphic resolution

Environment/lithology: shallow subtidal; sandstone

Collection methods: mechanical,

Primary reference: E. C. Allison. 1955. Middle Cretaceous gastropoda from Punta China, Baja California, Mexico. Journal of Paleontology 29(3):400-432 [J. Alroy/M. Sommers/J. Alroy] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 1888: authorized by John Alroy, entered by Mike Sommers on 10.06.1999

Creative Commons license: CC BY-NC-ND (attribution-noncommercial-no derivatives)