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. The formation is famous for being where the Sacabambaspis, a jawless fish that has become a popular internet meme in recent years was discovered.^[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 / -17.8; -65.8
Approximate paleocoordinates	45.1°S 127.5°W / -45.1; -127.5
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