Sierra del Alamo Section, Unit 16 (Jurassic to of Mexico)

Where: Sonora, Mexico (30.7° N, 112.6° W: paleocoordinates 17.2° N, 55.3° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Lower Member (Sierra de Santa Rosa Formation), Hettangian to Hettangian (201.3 - 190.8 Ma)

• Sequence X; stratigraphy based on ammonites.

• group of beds-level stratigraphic resolution

Environment/lithology: open shallow subtidal; lithified, gray limestone and lithified, fine-grained mudstone

Size class: macrofossils

Preservation: cast, mold/impression

Collection methods: bulk, surface (float),

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/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 115210: authorized by Arnold Miller, entered by Sarah Kolbe on 31.08.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

 Arcida - Parallelodontidae
Grammatodon sulcatus Aberhan 1994 clam
 Pectinida - Pectinoidae
Agerchlamys wunschae Marwick 1953 scallop
 Pectinida - Neitheoidae
Weyla unca Philippi 1899 scallop
 Mytilida - Mytilidae
 Carditida - Astartidae
Neocrassina gueuxi d'Orbigny 1850 clam
 Carditida - Cardiniidae
? Cardinia "sp. A" Edwards 1837 clam
Cardinia concinna Sowerby 1819 clam
 Cardiida - Cardiidae
Protocardia truncata Sowerby 1827 cockle
 Lucinida - Lucinidae
Lucinidae indet. Fleming 1828 clam