Río Cachirí Group
Geological group in the Venezuelan Andes / From Wikipedia, the free encyclopedia
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The Río Cachirí Group (Spanish: Grupo Río Cachirí, PZc) is a geological group of the Cesar-Ranchería Basin, Colombia and the Serranía del Perijá of the northernmost Colombian and Venezuelan Andes. The group of shales, sandstones and limestones is of Devonian age and has a maximum thickness in the Venezuelan section of 2,438 metres (7,999 ft). The group contains abundant fauna; crinoids, bryozoa, brachiopods and molluscs have been found in the group.
Quick Facts Type, Unit of ...
Río Cachirí Group | |
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Stratigraphic range: Devonian 419–360 Ma | |
Type | Geological group |
Unit of | Cesar-Ranchería Basin, Serranía del Perijá |
Sub-units | Caño Grande Fm., Caño del Oeste Fm., Campo Chico Fm., Los Guineos Fm. |
Underlies | Carboniferous sequence |
Overlies | Perijá Formation |
Thickness | ~1,100 m (3,600 ft) (Colombia) 2,438 m (7,999 ft) (Venezuela) |
Lithology | |
Primary | Shale, sandstone |
Other | Limestone |
Location | |
Coordinates | 10°50′03″N 72°14′23″W |
Region | Cesar, La Guajira Zulia |
Country | Colombia Venezuela |
Extent | ~110 km (68 mi) (Venezuela) |
Type section | |
Named for | Río Cachirí |
Named by | Liddle |
Location | Mara |
Year defined | 1928 |
Coordinates | 10°50′03″N 72°14′23″W |
Region | Zulia |
Country | Venezuela |
Thickness at type section | 2,438 m (7,999 ft) |
Paleogeography of the Middle Devonian 380 Ma, by Stampfli & Borel |
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