Bed 16, Section 1 - Lajas (Chulec Fm) (Cretaceous of Peru)

Where: Cajamarca, Peru (6.6° S, 78.7° W: paleocoordinates 12.1° S, 50.7° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Chulec Formation, Albian (113.0 - 100.5 Ma)

• Collection from a 255 m thick marl unit, lying below the Pariatambo Formation (late middle Albian) and above the Inca Formation (lower Albian). The Chulec Formation varies in thickness significantly through the regions, ranging from 25 to 500 m in thickness. The formation does appear to have a diachronous base, and in places ranges from Aptian to early Albian at its base, but in most places the formation is considered to fall completely within the middle Albian.

• group of beds-level stratigraphic resolution

Environment/lithology: lithified, shelly/skeletal, gray, argillaceous marl and lithified, shelly/skeletal, brown, gray limestone

• No paleoenvironmental data reported.
• Marl, grayish to brownish, thin-bedded, shaly, fossiliferous, with a few interbeds of massive, brownish gray to medium gray, fossiliferous 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 56908: 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.
Cephalopoda
 Ammonitida - Knemiceratidae
Knemiceras sp. Böhm 1898 ammonite