Where: Chubut, Argentina (42.7° S, 70.0° W: paleocoordinates 45.1° S, 59.0° W)

• coordinate based on unpublished field data

• small collection-level geographic resolution

When: Lefipán Formation, Danian (65.5 - 61.7 Ma)

• K/T boundary (basis of SM30) is at 0 m. Beds lumped over 0.30 m. Data from bed/horizon refers to midpoint of sampled beds.

• group of beds-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; sandstone

Size classes: macrofossils, mesofossils

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

Collected by Aberhan, M., Kiessling, W., Scholz, H., Medina, F. A. in 2003

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 unpublished Ph.D. thesis.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 74130: authorized by Wolfgang Kiessling, entered by Sven Weidemeyer on 24.07.2007