Bed 10, 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 65 m thick limestone unit, lying below the Pariatambo Formation (late middle Albian) and immediately 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.

• bed-level stratigraphic resolution

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

• No paleoenvironmental data reported.
• Limestone, slightly argillaceous, medium to dark gray, thin to medium-bedded, fossiliferous, weathers yellowish white with a few intercalations of yellowish marl.

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 56911: authorized by Austin Hendy, entered by Austin Hendy on 28.11.2005, edited by Briony Mamo

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.
Bivalvia
 Poromyida - Poromyidae
Liopistha sp. Meek 1864 clam
Misspelled in text as "Liophista"
 Ostreida - Gryphaeidae
Cephalopoda
 Ammonitida - Prolyelliceratidae
Prolyelliceras sp. Spath 1930 ammonite
Echinoidea
 Spatangoida - Toxasteridae
Enallaster sp. d'Orbigny 1853 heart urchin