Gran Bajo del Gualicho Fm (upper) - Scarabino et al. (2004) (Miocene to of Argentina)

Where: Rio Negro, Argentina (40.4° S, 65.3° W: paleocoordinates 40.9° S, 60.2° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Saladar Member (Gran Bajo del Gualicho Formation), Burdigalian to Burdigalian (20.4 - 13.8 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.

•Salina del Gualicho section, in Rio Negro Basin

•Was Lower member of Gran Bajo del Gualicho; however, Reichler names the member and further restricts the date to late Early Miocene-earliest Middle Miocene

• bed-level stratigraphic resolution

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

• No paleoenvironmental information reported. Faunal assemblage suggests shallow siliciclastic, warm-water conditions
• Intercalation of gray, oxidised sandstone and thin fossiliferous sandy mudstone beds.

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/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 43722: authorized by Austin Hendy, entered by Austin Hendy on 24.08.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Representative, but not exhaustive.
 Carditida - Carditidae
 Neogastropoda - Conidae
Conus sp. Linnaeus 1758 cone shell
 Cypraeoidea - Cypraeidae
"Cypraea posei" = Siphocypraea posei
"Cypraea posei" = Siphocypraea posei Figueiras 1985 cowry
 Sorbeoconcha - Turritellidae
Turritella hauthali turret shell
 Clypeasteroida - Monophorasteridae
Iheringiella sp. Berg 1898 sand dollar