Bed 33, Section 1 - Lajas (Conor Fm) (Cretaceous of Peru)

Where: Cajamarca, Peru (6.6° S, 78.7° W: paleocoordinates 12.4° S, 55.5° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Conor Formation (Quillquinan Group), Turonian (93.9 - 89.8 Ma)

• Collection from a 12 m thick marl unit, immediately above contact with Romiron Fm (late Cenomanian). The formation is 90 m thick at its type section; 157 m thick at this section. The formation conatins an early Turonian age based on ammonite biostratigraphy.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, ferruginous, shelly/skeletal, brown, gray, yellow marl and shelly/skeletal, brown limestone

• The Conor Fm represents records the deepening of waters with diminution of faunas and increase in calcareous materials, chaing from shales into limestones below and above the unit. No paleoenvironmental interpretation provided.
• Marl, yellowish gray, slightly ferruginous, nodular, weathers brownish, fossiliferous, with interbeds of thick-bedded, massive, fossiliferous light brown 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 56900: 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
Cephalopoda
 Ammonitida - Coilopoceratidae
Coilopoceras sp., Hoplitoides sp.
Coilopoceras sp. Hyatt 1903 ammonite
Hoplitoides sp. von Koenen 1898 ammonite
Echinoidea
 Euechinoidea - Orthopsidae
Orthopsis titicacana