Angostura Colorada Formation
Late Cretaceous geologic formation of Argentina
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The Angostura Colorada Formation is a Campanian to Maastrichtian geologic formation of the Neuquén Basin and North Patagonian Massif in the Río Negro Province of Argentina. Dinosaur remains diagnostic to the genus level are among the fossils that have been recovered from the formation.[1]
| Angostura Colorada Formation | |
|---|---|
| Stratigraphic range: Campanian-Maastrichtian | |
| Type | Geological formation |
| Underlies | Coli Toro Formation, Huitrera & Collón Cura Formations |
| Overlies | Sañicó Formation |
| Lithology | |
| Primary | Sandstone, claystone, conglomerate |
| Location | |
| Coordinates | 41.3°S 68.7°W |
| Approximate paleocoordinates | 43.9°S 54.7°W |
| Region | Río Negro Province |
| Country | Argentina |
| Extent | Neuquén Basin, North Patagonian Massif |
| Type section | |
| Named by | Volkhaimer |
| Year defined | 1973 |
  Angostura Colorada Formation (Argentina) | |
Description
The Angostura Colorada Formation was defined by Volkhaimer in 1973 and unconformably overlies the Late Triassic volcanics of the Sañicó Formation. The formation is partly overlain by the Huitrera and Collón Cura Formations,[2] and in other parts by the Coli Toro Formation.[3] The formation, outcropping south of Comallo, comprises sandstones, claystones and conglomerates deposited in a fluvial environment.[4]
Fossil content
Color key
|
Notes Uncertain or tentative taxa are in small text; |
Dinosaurs
Ornithischians
| Ornithischians of the Angostura Colorada Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Image |
| Hadrosauridae Indet. | Indeterminate | |||||
| Parankylosauria Indet.[5] | Indeterminate | |||||
Sauropods
| Sauropods of the Angostura Colorada Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Aeolosaurus[1] | A. rionegrinus | A aeolosaurin lithostrotian | ||||
| Lithostrotia Indet.[1] | Indeterminate | |||||
| Saltasaurinae Indet.[6] | Indeterminate | |||||
Theropods
| Theropods of the Angostura Colorada Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Abelisauridae Indet.[7] | Indeterminate | |||||