PBDB Collection

Cerrito del Mamifero, Los Alamitos vertebrates, middle section (Cretaceous to of Argentina)

Also known as Green-coloured bed (mammals), Cerro Cuadrado, Arroyo Verde

Where: Río Negro, Argentina (42.1° S, 66.3° W: paleocoordinates 45.0° S, 52.4° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Los Alamitos Formation, Late/Upper Campanian to Late/Upper Campanian (83.5 - 66.0 Ma)

• Mammals: Middle section of Los Alamitos Formation - green-coloured bed just below the concretionary top of the Cerrito del Mamifero, Alamitian provincial age (Campanian sensu lato)

• group of beds-level stratigraphic resolution

Environment/lithology: lacustrine - large; green, yellow lime mudstone

• dominant environment lacustrine, more brackish than fresh (clay flocculation in pelites). waters were oxygenated; lake permanent and shallow.

•The paleoenvironment according to Andreis (1987; and personnal communication) is that of a lacustrine environment mixed with shallow marine sediments, as indicated by the presnce of glauconite in some levels of the sequence.

• green-coloured bed just below the concretionary top of the Cerrito del Mamifer

Size classes: macrofossils, mesofossils

Preservation: trace

Collected by J. F. Bonaparte, J. E. Powell in 1982-1986; reposited in the MACN

Collection methods: quarrying, surface (float), surface (in situ), mechanical,

Primary reference: J. F. Bonaparte. 1990. New Late Cretaceous mammals from the Los Alamitos Formation, Northern Patagonia. National Geographic Research 6(1):63-93 [R. Benson/R. Benson]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 231686: authorized by Evangelos Vlachos, entered by Evangelos Vlachos on 28.08.2023

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

Mammalia
- Bondesiidae	Bondesius ferox n. gen. n. sp. Bondesius ferox n. gen. n. sp. Bonaparte 1990 mammal MACN-RN 161 (holotype, right lower molar crown); 162 (right upper molar crown)
Allotheria -	"Vucetichia gracilis n. gen. n. sp." = Ferugliotherium windhauseni "Vucetichia gracilis n. gen. n. sp." = Ferugliotherium windhauseni Bonaparte 1986 mammal MACN-RN 174 (holotype upper molar), 175 (upper molar)
Theriamorpha -	Brandonia intermedia n. gen. n. sp., Barberenia araujoae n. gen. n. sp. Brandonia intermedia n. gen. n. sp. Bonaparte 1990 mammal MACN-RN 164 (holotype right upper molar), 165 (right upper molar), 176 (left upper molar), 230 (left upper molar) Barberenia araujoae n. gen. n. sp. Bonaparte 1990 mammal MACN-RN 167 (holotype left upper molar), 167-170 (molars/jaw fragments))
Meridiolestida -	Austrotriconodon sepulvedai n. sp., "Reigitherium bunodonta n. gen. n. sp." = Reigitherium bunodontum Austrotriconodon sepulvedai n. sp. Bonaparte 1992 mammal MACN-RN 239 (holotype left lower molar), 240, 242,243, 1134 "Reigitherium bunodonta n. gen. n. sp." = Reigitherium bunodontum Bonaparte 1990 mammal MACN-RN 173 (holotype left upper molar)
Meridiolestida - Mesungulatidae	Quirogatherium major n. gen. n. sp. Quirogatherium major n. gen. n. sp. Bonaparte 1990 mammal MACN-RN 171 (holotype right upper molar), 245 (upper molar)
Meridiolestida -	Leonardus cuspidatus n. gen. n. sp. Leonardus cuspidatus n. gen. n. sp. Bonaparte 1990 mammal MACN-RN 172 (holotype left maxilla with four of the last molars), 231 (left upper molar), 1097
Dryolestida - Casamiquelidae	Casamiquelia rionegrina n. gen. n. sp. Casamiquelia rionegrina n. gen. n. sp. Bonaparte 1990 mammal MACN-RN 163 (holotype right upper molar), 229 (upper molar), 1032, 1033