Cañadón Calcáreo Formation
The Cañadón Calcáreo Formation is an Oxfordian to Kimmeridgian-aged geologic formation, from the Cañadón Asfalto Basin in Chubut Province, Argentina, a rift basin that started forming since the earliest Jurassic. It was formerly thought to date into the Cretaceous, but the age has been revised with Uranium–lead dating as likely being solely Late Jurassic in age.
| Cañadón Calcáreo Formation | |
|---|---|
| Stratigraphic range: Oxfordian-Tithonian ~ | |
| Type | Geological formation |
| Unit of | Sierra de Olte Group |
| Underlies | Los Adobes Formation |
| Overlies | Cañadón Asfalto Formation |
| Lithology | |
| Primary | Sandstone |
| Other | Shale, tuffite |
| Location | |
| Location | Patagonia |
| Coordinates | 43.2°S 69.1°W |
| Approximate paleocoordinates | 40.6°S 30.0°W |
| Region | Chubut Province |
| Country | Argentina |
| Extent | Cañadón Asfalto Basin |
Formation map and location, Shaded vertically | |
It is a subunit of the Sierra de Olte Group, close to the city Cerro Condor in the Chubut Province of northwestern Patagonia, in southern Argentina. The formation is composed primarily of fluvial sandstones alongside shales and volcanic tuffites
The formation preserves fishes, crocodylomorphs and some dinosaur taxa, as well as conifers.
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