Chacay Melehue (Early Callovian) (Jurassic of Argentina)

Where: Nequen, Argentina (37.2° S, 70.5° W: paleocoordinates 34.5° S, 32.4° W)

• outcrop-level geographic resolution

When: Vergarensis and Bodenbenderi zone, Early/Lower Callovian (164.7 - 161.2 Ma)

• formation name not given

one collection in six is from the latest Bathonian Steinmanni Zone

• member-level stratigraphic resolution

Environment/lithology: marine; concretionary shale

• inoceramids preserved as internal molds

no paleoenvironmental data

• dark shales with concretionary levels and thin intercalated tuffaceous beds

Primary reference: S. E. Damborenea. 1990. Middle Jurassic inoceramids from Argentina. Journal of Paleontology 64(5):736-759 [J. Alroy/J. Alroy/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 4883: authorized by John Alroy, entered by John Alroy on 28.08.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

• composite of material from at least six collections spanning nearly 100 m

list ends with the phrase "and others"

Show authors, comments, and common names
Cephalopoda
 Ammonitida - Sphaeroceratidae
Xenocephalites gottschei, Stehnocephalites gerthi, Eurycephalites vergarensis, Eurycephalites rotundus
Stehnocephalites gerthi Spath 1928 ammonite
Eurycephalites rotundus Tornquist 1898 ammonite
 Ammonitida - Perisphinctidae
Neuqueniceras steinmanni, Choffatia jupiter
Choffatia jupiter Steinmann 1881 ammonite
Bivalvia
 Myalinida - Inoceramidae
Retroceramus stehni n. sp.