Alcântara Formation
Brazilian geological formation / From Wikipedia, the free encyclopedia
The Alcântara Formation is a geological formation in northeastern Brazil whose strata date back to the Cenomanian of the Late Cretaceous.[1]
Quick Facts Type, Unit of ...
Alcântara Formation | |
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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 / -2.5; -44.5 |
Approximate paleocoordinates | 9.4°S 19.3°W / -9.4; -19.3 |
Region | Maranhão |
Country | Brazil |
Extent | São Luís-Grajaú Basin |
Type section | |
Named for | Alcântara (city) |
Named by | Rossetti & Truckenbrodt |
Year defined | 1997 |
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