NCW 4a (Cretaceous to of Argentina)

Where: Rio Negro, Argentina (39.7° S, 67.5° W: paleocoordinates 42.1° S, 55.7° W)

When: Roca Formation (Malargüe Group), Maastrichtian to Maastrichtian (72.1 - 61.6 Ma)

Environment/lithology: marine; unlithified, argillaceous, sandy claystone

• Existence of two facies: a deeper one and a coastal one.
• The sediments are formed by clays, marls, clayey limestones, sandy, sometimes somewhat sandy, with variable proportions of gypsum and limestones microcoquinoids, varying their colour.

•res between orange, yellow, whitish and gray.

Size class: microfossils

Preservation: cast

Collection methods: surface (in situ),

Primary reference: A. Bertels. 1964. Micropaleontología del Paleoceno de General Roca (provincia de Río Negro). Revista del Museo de La Plata IV(23):125-184 [E. Vlachos/F. Aspromonte]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 236481: authorized by Evangelos Vlachos, entered by Maria Maldonado on 04.10.2024

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Nodosariata
 Vaginulinida - Vaginulinidae
Lenticulina (Planularia) sp.
Lenticulina (Planularia) sp. Bartenstein 1948
1 specimen
 Nodosariida - Nodosariidae
Vaginulina sp.
Vaginulina sp. d'Orbigny 1826
1 specimen
Globothalamea
 Rotaliida - Cibicididae
Cibicides reinholdi
Cibicides reinholdi Ten Dam 1944
1 specimen