Sierra del Alamo, Unit 2 (Triassic of Mexico)

Where: Sonora, Mexico (30.7° N, 112.6° W: paleocoordinates 14.6° N, 55.1° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Upper Member (Antimonio Formation), Rhaetian (208.5 - 201.3 Ma)

• early Rhaetian

• member-level stratigraphic resolution

Environment/lithology: marine; siltstone

Size class: macrofossils

Preservation: mold/impression

Primary reference: C. A. McRoberts. 1997. Late Triassic (Norian-Rhaetian) bivalves from the Antimonio Formation, northwestern Sonora, Mexico. Revista Mexicana de Ciencias Geológicas 14(2):167-177 [M. Aberhan/S. Nurnberg/S. Nurnberg]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 39203: authorized by Martin Aberhan, entered by Sabine Nürnberg on 23.05.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

 Pectinida - Limidae
Pseudolimea sp. Douglas and Arkell 1932 file clam
 Cardiida - Cardiidae
Septocardia sp. Hall 1877 cockle
 Trigoniida - Trigonodidae
 Protobranchia - Nuculanidae
Xiaoschuiculana tozeri n. sp. pointed nut clam
 Pentacrinoidea -
Pentacrinoidea indet. Jaekel 1918 Sea lily
Plantae indet. Haeckel 1866