San Benito Formation, Bolivia

Short description: Geologic formation in Bolivia

San Benito Formation
Stratigraphic range: Katian
~460–446 Ma

PreЄ

Type| Geological formation
Unit of| Cochabamba Group
Underlies| Cancañiri Formation
Overlies| Anzaldo Formation
Thickness| 500 m (1,600 ft)
Lithology
Primary| Sandstone, siltstone
Other| Shale
Location
Coordinates|  [ ⚑ ] : 17°00′S 66°00′W﻿ / ﻿17.0°S 66.0°W﻿ / -17.0; -66.0
Paleocoordinates|  [ ⚑ ] 45°36′S 126°36′W﻿ / ﻿45.6°S 126.6°W﻿ / -45.6; -126.6
Region| Cochabamba Department
Country|  Bolivia
Extent| Cordillera Oriental
Type section
Named for| Cerro San Benito

San Benito Formation, Bolivia (Bolivia)

The San Benito Formation is a Katian geologic formation of central Bolivia. The formation belongs to the Cochabamba Group, overlies the Anzaldo Formation and is overlain by the Cancañiri Formation. The 500 metres (1,600 ft) thick formation comprises a succession of shallow water quartzitic sandstones with minor interbeds of dark grey micaceous siltstones. Shelly fossils have been found at few horizons and consist mainly of linguliformean brachiopods, bivalves, and a few homalonotid trilobite remains. Poorly preserved graptolites occur occasionally in the shaly beds.[1]

## Contents

* 1 Fossil content
* 2 See also
* 3 References
* 4 Further reading

## Fossil content

The formation has provided the following fossils:

* Desmochitina minor
* Rafinesquina pseudoloricata
* Tunariorthis cardocanalis
* Villosacapsula setosapellicula
* Ancyrochitina cf. ancyrea
* Hirnantia cf. transgrediens
* Rhabdochitina cf. magna
* Bistramia sp.
* Ctenodonta sp.
* Lingula sp.

## See also

* List of fossiliferous stratigraphic units in Bolivia

## References

1. ↑ Sikhiri River at Fossilworks.org

## Further reading

* J. L. Benedetto. 2013. Upper Ordovician Brachiopods from the San Benito Formation, Cordillera del Tunari, Bolivia. Ameghiniana 50(4):418-428
* R. Suárez Soruco. 1976. El sistema ordovícico en Bolivia. Revista Tecnica YPF Bolivia 5(2):111-123

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