Bed 4, Section 4 - Celendín [Crisnejas Fm] (Cretaceous of Peru)

Where: Cajamarca, Peru (6.9° S, 78.2° W: paleocoordinates 11.2° S, 48.7° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

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

• LITHOSTRATIGRAPHY: From the Crisnejas Fm, which locally overlies the Goyllarisquisga Fm (Early Cretaceous), and is overlain by the Pulluicana Gp (Albian-Cenomanian). AGE: Early Albian, on the basis of ammonite biostratigraphy and stratigraphic position; ? Knemiceras raimondii zone. STRATIGRAPHIC POSITION: Collection from unit 4, a 29 m thick shale unit, in the lower portion of the section.

• bed-level stratigraphic resolution

Environment/lithology: lithified, brown, gray shale

• LITHOLOGY: Shale, gray, finely laminated, soft, brownish-weathering, with thick interbeds of massive, iron-stained, grayish brown, highly fossiliferous limestone. 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 88171: authorized by Austin Hendy, entered by Austin Hendy on 02.04.2009

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.
unclassified
  -
Echinoidea
 Spatangoida - Toxasteridae
Enallaster peruanus heart urchin
 Holectypoida - Holectypidae
"Holectypus planatus" = Coenholectypus neocomiensis
"Holectypus planatus" = Coenholectypus neocomiensis Gras 1848 sea urchin
SUBSPECIES: Holectypus planatus numismalis
Cephalopoda
 Ammonitida - Knemiceratidae
"Knemiceras raimondii" = Glottoceras raimondii, "Knemiceras gabbi" = Glottoceras gabbi
"Knemiceras raimondii" = Glottoceras raimondii Lisson 1908 ammonite
SUBSPECIES: Knemiceras raimondii pacificum
"Knemiceras gabbi" = Glottoceras gabbi Hyatt 1903 ammonite
Bivalvia
 Trigoniida - Megatrigonioidae
 Trigoniida - Steinmanellidae
 Trigoniida - Trigoniidae
Buchotrigonia abrupta von Buch 1838 clam