Sierra del Alamo, Antimonio Formation, Locality 4 (Triassic of Mexico)

Where: Sonora, Mexico (30.7° N, 112.6° W: paleocoordinates 6.5° N, 47.4° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Lower Member (Antimonio Formation), Carnian (237.0 - 228.0 Ma)

• based on ammonites, Dilleri zone

• bed-level stratigraphic resolution

Environment/lithology: open shallow subtidal; red, calcareous mudstone

Size class: macrofossils

Preservation: cast, mold/impression

Collection methods: bulk,

Primary reference: G. D. Stanley, Jr., C. Gonzalez-Leon, M. R. Sandy, B. Senowbari-Daryan, P. Doyle, M. Tamura, and D. H. Erwin. 1994. Upper Triassic invertebrates from the Antimonio Formation, Sonora, Mexico. The Paleontological Society Memoir 36:1-33 [M. Aberhan/S. Nurnberg/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 39173: authorized by Martin Aberhan, entered by Sabine N├╝rnberg on 23.05.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

 Aulacoceratida - Aulacoceratidae
 Aulacoceratida - Xiphoteuthididae
Calliconites cf. drakei Smith 1927 belemnite
Calliconites milleri n. sp. Doyle 1994 belemnite