Bed 3, Section 17 - Carhuaz (Santa Fm) (Cretaceous of Peru)

Where: Ancash, Peru (9.3° S, 77.7° W: paleocoordinates 10.1° S, 44.4° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Santa Formation, Valanginian (139.8 - 132.9 Ma)

• Collection from a 25 m thick limestone unit, lying below the Carhuaz Formation (late Valanginian-Aptian) and above the Chimu Sandstone (early Valanginian). The Santa Formation is 341 m thick at this section. The formation was originally placed within the Barremian by Steinmann (1930) but the present author suggests it belongs within the Valanginian.

• group of beds-level stratigraphic resolution

Environment/lithology: marginal marine; lithified, concretionary, dolomitic, shelly/skeletal, brown, gray, yellow limestone and black, gray shale

• The Santa Formation represents a change from the non-marine conditions that prevailed during deposition of the Chimu sandstone to a shallow marine to brackish water environment.
• Limestone, dark gray, somewhat dolomitic, medium-bedded, platy, fossiliferous, with large limestone concretions and chert nodules, weathers yellow brown, and has interbeds of splintery, grayish black shale.

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 56944: authorized by Austin Hendy, entered by Austin Hendy on 29.11.2005

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
Gastropoda
 Sorbeoconcha - Cassiopidae
Paraglauconia strombiformis
Bivalvia
 Cardiida - Cyrenidae
Cyrena huarazensis