Where: Rio Negro, Argentina (40.4° S, 65.3° W: paleocoordinates 41.4° S, 58.4° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Lower Member (Gran Bajo del Gualicho Formation), Late/Upper Eocene to Late/Upper Eocene (37.2 - 11.6 Ma)

• The area is characterized by exposures of fossiliferous Cenozoic marine rocks overlying Jurassic porphyrites of the Marfil Formation. The Gran Bajo del Gualicho Formation is represented by an intercalation of up to 20 m of gray, oxidised sandstone and thin fossiliferous sandy mudstone beds. Camacho (1987) recognized two layers of coquina at the base and top of section. Uncertain age of late Eocene to middle Miocene, the evidence is sumarized here: overlies Paleocene, underlies late Miocene; assemblage includes Venericor (Paleogene index fossil) - hence late Eocene; some workers have identified Venericor in beds with early to middle Miocene palynology.

• bed-level stratigraphic resolution

Environment/lithology: coastal; gray sandstone and shelly/skeletal, sandy mudstone

Size class: macrofossils

Collection methods: quarrying,

• Collections reposited in the MPB (Museo Paleontologico de Bariloche, Argentina).

Primary reference: F. Scarabino, S. Martinez, C.J. Del Rio, A.E. Olenik, H.H. Comacho and W. J. Zinsmeister. 2004. Two new species of Adelomelon Dall, 1906 (Gastropoda: Volutidae) from the Tertiary of Patagonia (Argentina). Journal of Paleontology 78(5):914-919 [A. Miller/A. Hendy/O. Alfaro]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 43721: authorized by Austin Hendy, entered by Austin Hendy on 24.08.2004

Creative Commons license: CC BY (attribution)