Earth:Anzaldo Formation
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Short description: Ordovician geologic formation in Bolivia
| Anzaldo Formation Stratigraphic range: Katian ~460–446 Ma | |
|---|---|
| Type | Geological formation |
| Unit of | Cochabamba Group |
| Underlies | San Benito Formation |
| Overlies | Capinota Formation |
| Lithology | |
| Primary | Sandstone |
| Location | |
| Coordinates | [ ⚑ ] : 17°48′S 65°48′W / 17.8°S 65.8°W |
| Paleocoordinates | [ ⚑ ] 45°06′S 127°30′W / 45.1°S 127.5°W |
| Region | Cochabamba Department |
| Country |  Bolivia |
| Extent | Cordillera Oriental |
  Anzaldo Formation (Bolivia) | |
The Anzaldo Formation is a Katian geologic formation of central Bolivia. The formation belongs to the Cochabamba Group, overlies the Capinota Formation and is overlain by the San Benito Formation.[1]
Fossil content
The formation has provided the following fossils:
Fish
- Pteraspidomorphi
- Huemacaspis bistrami[2]
- Sacabambaspis janvieri[3][4]
Trilobites
- Leiostegina inexpectans[5]
Bivalves
- ?Grammysia sp.[5]
- ?Modiomorpha sp.[5]
- ?Parallelodon sp.[5]
- "Ctenodonta" sp.[5]
- "Goniophorina" sp.[5]
Gastropods
- Gyrospira tourteloti[5]
Lingulida
See also
- List of fossiliferous stratigraphic units in Bolivia
- Cancañiri Formation
- La Ciénega Formation
- Santiago Formation
References
Bibliography
- Pradel, A.; I. J. Sansom; P.-Y. Gagnier; R. Cespedes, and P. Janvier. 2007. The tail of the Ordovician fish Scabambaspis. Biology Letters 3. 72–75.
- Emig, C. C., and Z. Herrera. 2006. Dignomia munsterii (Brachiopoda, Lingulata) from the Ordovician of Bolivia, with redescription of the genus. Geodiversitas 28. 227–237.
- Gagnier, P. Y.; A. Blieck; C. C. Emig; T. Sempere; D. Vachard, and M. Vanguestaine. 1996. New paleontological and geological data on the Ordovician and Silurian of Bolivia. Journal of South American Earth Sciences 9. 329–347.
- Branisa, L. 1965. Los fósiles guias de Bolivia: I. Paleozoico. Boletín de Servicio Geologico de Bolivia La Paz, Bolivia 6. 1–282.
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