Anzaldo Formation

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]

Anzaldo Formation Stratigraphic range: Katian ~460–446 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Unit of	Cochabamba Group
Underlies	San Benito Formation
Overlies	Capinota Formation
Lithology
Primary	Sandstone
Location
Coordinates	17.8°S 65.8°W
Approximate paleocoordinates	45.1°S 127.5°W
Region	Cochabamba Department
Country	Bolivia
Extent	Cordillera Oriental
Anzaldo Formation (Bolivia)

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

• Bistramia elegans[3]
• Dignomia munsterii[2][3]

See also

• List of fossiliferous stratigraphic units in Bolivia
• Cancañiri Formation
• La Ciénega Formation
• Santiago Formation

References

1. Anzaldo Formation at Fossilworks.org
2. Emig & Herrera, 2006
3. Gagnier et al., 1996
4. Pradel et al., 2007
5. Branisa, 1965

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 Science 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.