Alcântara Formation
The Alcântara Formation is a geological formation in northeastern Brazil whose strata date back to the Cenomanian of the Late Cretaceous.
| Alcântara Formation | |
|---|---|
| Stratigraphic range: Cenomanian | |
| Type | Geological formation |
| Unit of | Itapecuru Group |
| Underlies | Cujupe Formation |
| Overlies | Undifferentiated unit |
| Thickness | 30–35 m (98–115 ft) |
| Lithology | |
| Primary | Sandstone |
| Other | Claystone, conglomerate |
| Location | |
| Coordinates | 2.5°S 44.5°W |
| Approximate paleocoordinates | 9.4°S 19.3°W |
| Region | Maranhão |
| Country | Brazil |
| Extent | São Luís-Grajaú Basin |
| Type section | |
| Named for | Alcântara (city) |
| Named by | Rossetti & Truckenbrodt |
| Year defined | 1997 |
Alcântara Formation (Brazil) | |
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