Río Loro Formation
| Río Loro Formation | |
|---|---|
| Stratigraphic range: Late Paleocene (Riochican) ~ | |
| Type | Geological formation |
| Underlies | Río Nío Formation |
| Overlies | Los Blanquitos Formation |
| Thickness | 95 m (312 ft) |
| Lithology | |
| Primary | Sandstone, siltstone |
| Other | Conglomerate, paleosols |
| Location | |
| Coordinates | 26°36′S 65°12′W / 26.6°S 65.2°W |
| Approximate paleocoordinates | 29°18′S 53°48′W / 29.3°S 53.8°W |
| Region | Tucumán Province |
| Country | Argentina |
| Extent | Sierras Pampeanas |
| Type section | |
| Named for | Río Loro |
| Named by | Bossi |
| Year defined | 1969 |
The Río Loro Formation is a geological formation of the Sierras Pampeanas in Tucumán Province Argentina whose strata date back to the Late Paleocene of the Paleogene, or Riochican in the SALMA classification.
The formation has been deposited in a meandering fluvial environment and has a maximum noted thickness of 95 metres (312 ft).
The formation has provided fossils of several mammals and reptiles. The crocodylian genus Lorosuchus and mammal species Eoastrapostylops riolorense were named after the formation which is correlated with the Mealla Formation of the Salta Basin to the northwest of Tucumán Province.