Río Pachitea [Chonta Fm] (Cretaceous to of Peru)

Where: Peru (8.8° S, 74.5° W: paleocoordinates 14.5° S, 51.9° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Chonta Formation, Turonian to Turonian (93.9 - 86.3 Ma)

• LITHOSTRATIGRAPHY: From the Chonta Fm, which overlies the Oriente Fm, and is overlain by the Vivian Fm. AGE: Turonian-Coniacian, on the basis of ammonite biostratigraphy. STRATIGRAPHIC POSITION: From unknown position within formation.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; black shale and siltstone

• LITHOLOGY: Shales and siltstones. LITHIFICATION: No basis to determine lithification.

Size class: macrofossils

Collection methods: surface (in situ),

• COLLECTOR: Probably Knetchtel and others. REPOSITORY: Unknown.

Primary reference: B. Kummel. 1948. Geological reconnaissance of the Contamana region, Peru. Geological Society America Bulletin 59:1217-1265 [A. Hendy/A. Hendy]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 88672: authorized by Austin Hendy, entered by Austin Hendy on 17.04.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Comprehensive for ammonoids, bivalves, and other invertebrates groups; much diversity not reported, however. NOMENCLATURE: Not an authoritative publication, with somewhat antiquated nomenclature, but with species-resolution identifications.
unclassified
  -
Cephalopoda
 Ammonitida - Desmoceratidae
 Ammonitida - Acanthoceratidae
Buchiceras bilobatum Hyatt 1875 ammonite
 Ammonitida - Tissotiidae
"Tissotia auressensis" = Metatissotia auressensis Peron 1897 ammonite
Tissotia andii ammonite
Tissotia obesa ammonite
Tissotia fourneli Bayle 1849 ammonite
Tissotia halli Knechtel 1947 ammonite
 Ammonitida - Sphenodiscidae
"Lenticeras baltae" = Lenticeras baltai Lissón 1908 ammonite
 Ammonitida - Collignoniceratidae
 Ammonitida - Coilopoceratidae
Coilopoceras lassali ammonite
MISSPELT: Coelopoceras lassali
Gastropoda
 Cerithioidea - Turritellidae
Turritella sp. Lamarck 1799 turret shell
 Sorbeoconcha - Naticidae
Natica lassali moon snail
Bivalvia
 Arcida - Cucullaeidae
Cucullaea maresi Coquand 1880 clam
MISSPELT: Cucullea maresi
 Pectinida - Limidae
Lima ellsworthi file clam
Lima shortani file clam
"Lima grenieri" = Lima (Plagiostoma) grenieri Coquand 1862 file clam
 Ostreida - Ostreidae
"Ostrea nicaisei" = Nicaisolopha nicaisei
"Ostrea nicaisei" = Nicaisolopha nicaisei Coquand 1862 oyster
 Poromyida - Poromyidae
 Pholadomyida - Pholadomyidae
 Cardiida - Arcticidae
 Cardiida - Cardiidae
Echinoidea
 Spatangoida - Hemiasteridae
Hemiaster steinmanni, "Hemiaster fourneli" = Mecaster fourneli
"Hemiaster fourneli" = Mecaster fourneli Agassiz and Dessor 1847 heart urchin