Ranges east of Sierra Santa Barbara (Paleocene of Argentina)

Where: Jujuy, Argentina (24.2° S, 64.3° W: paleocoordinates 26.9° S, 52.8° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Maíz Gordo Formation, Late/Upper Paleocene (58.7 - 55.8 Ma)

• Formation also called Sunchal

• group of beds-level stratigraphic resolution

Environment/lithology: lacustrine - small; lithified, green mudstone

• "The Maíz Gordo Formation, related to the last main flooding event of the basin, shows typical lacustrine limestone values, possibly with low organic productivity"

•The lake which formed the Maiz Gordo formation must have been very shallow because it has alternating lacustrine and partially exposed mudflat deposits

• Green rock, easily breaking into small angular fragments…In its upper part it shows streaks of red, increasing until we reach an entirely red deposit. Horizon with insects was typial green formation interbedded with limestone.

Size class: macrofossils

Preservation: mold/impression

Collected by G.L. Harrington in 1935; reposited in the AMNH

Primary reference: T. D. A. Cockerell. 1936. The Fauna of the Sunchal (or Margas Verdes) formation, Northern Argentina. American Museum Novitates 886:1-9 [M. Clapham/J. Karr]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 151867: authorized by Matthew Clapham, entered by Matthew Clapham on 13.10.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Insecta
 Orthoptera - Gryllidae
Gryllites vocalis n. sp.
Gryllites vocalis n. sp. Cockerell 1936 true crickets
AMNH 24523
 Coleoptera - Carabidae
Carabites harringtoni n. sp.
Carabites harringtoni n. sp. Cockerell 1936 ground beetle
AMNH 24522
Actinopteri
 Cyprinodontiformes - Cyprinodontidae
? Cyprinodon primulus n. sp.
? Cyprinodon primulus n. sp. Cockerell 1936