KT section Paso del Sapo, Canadón Asfalto Basin, SM56 (Paleocene of Argentina)

Where: Chubut, Argentina (42.7° S, 70.0° W: paleocoordinates 45.1° S, 58.9° W)

• coordinate based on unpublished field data

• small collection-level geographic resolution

When: Lefipán Formation, Danian (66.0 - 61.6 Ma)

• K/T boundary (basis of SM30) is at 0 m. Beds lumped over 0.20 m. Data from bed/horizon refers to midpoint of sampled beds.

• group of beds-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; mudstone

• inner shelf environment.

Size classes: macrofossils, mesofossils

Preservation: cast, mold/impression, original calcite, replaced with calcite

Collected by Aberhan, M., Kiessling, W., Weidemeyer, S. in 2004

Collection methods: bulk, mechanical,

Primary reference: S. Weidemeyer. 2007. Molluscs at the K/Pg boundary in Argentina: Extinction and recovery patterns. unpublished Ph.D. thesis. [W. Kiessling/S. Weidemeyer]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 74157: authorized by Wolfgang Kiessling, entered by Sven Weidemeyer on 26.07.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• Crustacea fragments were reported but not included.
Gastropoda
  -
Gastropoda indet. Cuvier 1795 snail
 Cerithioidea - Turritellidae
 Sorbeoconcha - Aporrhaidae
 Neogastropoda - Tudiclidae
Bivalvia
  -
Bivalvia indet. Linnaeus 1758 clam
 Lucinida - Lucinidae
Pteromyrtea sp. Finlay 1926 clam
 Poromyida - Cuspidariidae
Cuspidaria sp. Dall 1886 clam
 Cardiida - Corbiculidae
 Carditida - Astartidae
 Nuculida - Nuculidae
Leionucula suboblonga Wilckens 1907 nut clam
 Nuculanida - Nuculanidae
Ledina lepida pointed nut clam