Bed 50, Sunchubamba section (Cretaceous of Peru)

Where: Peru (7.4° S, 78.4° W: paleocoordinates 11.7° S, 49.0° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Inca Formation, Early/Lower Albian (112.0 - 109.0 Ma)

• LITHOSTRATIGRAPHY: From the Inca Fm, which overlies the Goyllarisquisga Fm (Aptian), and is overlain by the Chulec Fm (Albian). AGE: Early Albian, on the basis of ammonite biostratigraphy; Parahoplites nicholsoni.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified shale

• Shale, dark gray to black, laminated, soft, fossiliferous

Size class: macrofossils

Reposited in the AMNH

Collection methods: surface (in situ),


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: taxonomic analysis

PaleoDB collection 158985: authorized by Matthew Clapham, entered by Matthew Clapham on 24.07.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for ammonoids, bivalves, and other invertebrates groups. NOMENCLATURE: Authoritative publication, but with somewhat antiquated nomenclature, and species-resolution identifications.
 Trigoniida - Trigoniidae
Buchotrigonia abrupta von Buch 1838 clam
 Trigoniida - Megatrigonioidae
 Trigoniida - Steinmanellidae
 Ammonitida - Desmoceratidae
Desmoceras chimuense Benavides-Caceres 1956 ammonite
 Ammonitida - Knemiceratidae
"Knemiceras ollonense" = Glottoceras ollonense
"Knemiceras ollonense" = Glottoceras ollonense Gabb 1877 ammonite
 Ammonitida - Acanthohoplitidae
"Parahoplites nicholsoni n. sp." = Neodeshayesites nicholsoni, "Parahoplites inti" = Neodeshayesites inti, Parahoplites quilla
"Parahoplites nicholsoni n. sp." = Neodeshayesites nicholsoni Benavides-Caceres 1956 ammonite
"Parahoplites inti" = Neodeshayesites inti Benavides-Caceres 1956 ammonite
Parahoplites quilla Benavides-Caceres 1956 ammonite