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Sunchal (Cockerell collection) (Paleocene of Argentina)

Where: Jujuy, Argentina (23.5° S, 65.0° W: paleocoordinates 26.3° S, 52.9° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Maíz Gordo Formation, Paleocene (66.0 - 55.8 Ma)

• Formation also called Sunchal

• bed-level stratigraphic resolution

Environment/lithology: lacustrine - small; lithified, green, muddy mudstone and lithified, calcareous limestone

• "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 Cockerell in 1925; 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 151863: authorized by Matthew Clapham, entered by Matthew Clapham on 13.10.2013

Creative Commons license: CC BY (attribution)