Bed 29, Section 1 - Lajas (Choro Mbr) (Cretaceous of Peru)

Where: Cajamarca, Peru (6.6° S, 78.7° W: paleocoordinates 13.3° S, 54.2° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Choro Member (Mujarrun Formation), Cenomanian (100.5 - 93.9 Ma)

• Collection from a 105 m thick limestone unit, lying below the Culebra Member of the Mujarrun Formation (Cenomanian) and immediately above the Yumagual Formation (late Albian-early Cenomania). The member is as much as 300 m thick an early Cenomanian age fauna.

• group of beds-level stratigraphic resolution

Environment/lithology: lithified, concretionary, shelly/skeletal, gray, blue, silty limestone

• No paleoenvironmental interpretations reported.
• Limestone, argillaceous, light gray, nodular, thick-bedded, fossiliferous, interbedded with massive, light bluish gray limestone.

Size class: macrofossils

Reposited in the AMNH

Collection methods: quarrying,

• Collections reposited at AMNH.

Primary reference: V.E. Benavides-Caceres. 1956. Cretaceous system in northern Peru. Bulletin of the American Museum of Natural History 108(4):1-493 [A. Miller/A. Hendy]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 56904: authorized by Austin Hendy, entered by Austin Hendy on 28.11.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• Taxonomic list compiled by the author during 1951-1952. Nomenclature should therefore be somewhat antiquated, though systematics reflect supervision of Normal Newell, Columbia University and AMNH paleontologists.
Show authors, comments, and common names
Bivalvia
 Ostreida - Gryphaeidae
Exogyra cf. ponderosa