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°48′S 65°48′W / 17.8°S 65.8°W / -17.8; -65.8
Approximate paleocoordinates	45°06′S 127°30′W / 45.1°S 127.5°W / -45.1; -127.5
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]

The formation has provided the following fossils:

Pteraspidomorphi

• Huemacaspis bistrami ^[2]
• Sacabambaspis janvieri ^{[3] [4]}

• Leiostegina inexpectans ^[5]

• Gyrospira tourteloti ^[5]

• Bistramia elegans ^[3]
• Dignomia munsterii ^{[2] [3]}

• Pradel, A.; Sansom, I. J.; Gagnier, P.-Y.; Cespedes, R.; Janvier, P. (2007), "The tail of the Ordovician fish Scabambaspis", Biology Letters, 3 (1): 72–75, doi: 10.1098/rsbl.2006.0557, PMC  2373808, PMID  17443969
• Emig, C. C.; Herrera, Z. (2006), "Dignomia munsterii (Brachiopoda, Lingulata) from the Ordovician of Bolivia, with redescription of the genus", Geodiversitas, 28: 227–237
• Gagnier, P. Y.; Blieck, A.; Emig, C. C.; Sempere, T.; Vachard, D.; Vanguestaine, M. (1996), "New paleontological and geological data on the Ordovician and Silurian of Bolivia", Journal of South American Earth Sciences, 9 (5): 329–347, Bibcode: 1996JSAES...9..329G, doi: 10.1016/S0895-9811(96)00018-1
• Branisa, L (1965), "Los fósiles guias de Bolivia: I. Paleozoico", Boletín de Servicio Geologico de Bolivia la Paz, Bolivia, 6: 1–282