Cerro Yumagual, bed 3 [Yumagual Fm] (Cretaceous of Peru)

Where: Peru (6.3° S, 78.8° W: paleocoordinates 13.0° S, 54.3° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Yumagual Formation, Early/Lower Cenomanian (99.6 - 93.5 Ma)

• LITHOSTRATIGRAPHY: From the Yumagual Fm, which is locally overlain by the MujarrĂșn Fm (Cenomanian), and overlies the Pariatambo Fm (Middle Albian). AGE: Late Albian-Early Cenomanian, on the basis of ammonite biostratigraphy; Paraturrilites lewesiensis zone; placed here in Early Cenomanian on the basis of stratigraphic position. STRATIGRAPHIC POSITION: Collection from 140 m thick limestone unit, near the top of the section.

• group of beds-level stratigraphic resolution

Environment/lithology: lithified, nodular, brown, gray, argillaceous limestone

• LITHOLOGY: Limestone, very argillaceous, nodular, with interbeds of light brown, gray marl. LITHIFICATION: Lithified, on the basis of facies description.

Size class: macrofossils

Collected by Benavides; reposited in the AMNH

Collection methods: surface (in situ),

• COLLECTOR: V. E. Benavides. REPOSITORY: 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 88189: authorized by Austin Hendy, entered by Austin Hendy on 03.04.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Probably not exhaustive, but representative for ammonoids, bivalves, and other invertebrates groups. NOMENCLATURE: Authoritative publication, but with somewhat antiquated nomenclature, and species-resolution identifications.
Bivalvia
 Ostreida - Gryphaeidae
"Exogyra mermeti" = Rhynchostreon mermeti
"Exogyra mermeti" = Rhynchostreon mermeti Coquand 1862 oyster
Cephalopoda
 Ammonitida - Acanthoceratidae
"Sharpeiceras occidentale" = Sharpeiceras florencae
"Sharpeiceras occidentale" = Sharpeiceras florencae Spath 1925 ammonite
 Ammonitida - Turrilitidae
"Paraturrilites lewesiensis" = Mariella lewesiensis
"Paraturrilites lewesiensis" = Mariella lewesiensis Spath 1926 ammonite