Where: Neuquén, Argentina (37.6° S, 69.9° W: paleocoordinates 39.8° S, 57.8° W)

• coordinate based on unpublished field data

• small collection-level geographic resolution

When: Roca Formation (Malargüe Group), Maastrichtian (70.6 - 65.5 Ma)

• K/T boundary (basis of HU23) 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; lithified, coarse-grained, glauconitic, gray sandstone

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 unpublished Ph.D. thesis.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 74013: authorized by Wolfgang Kiessling, entered by Sven Weidemeyer on 17.07.2007