Anzaldo Formation Explained

Anzaldo Formation
Type:	Geological formation
Period:	Katian
Age:	Katian ~
Prilithology:	Sandstone
Region:	Cochabamba Department
Coordinates:	-17.8°N -65.8°W
Paleocoordinates:	-45.1°N -127.5°W
Unitof:	Cochabamba Group
Underlies:	San Benito Formation
Overlies:	Capinota Formation
Extent:	Cordillera Oriental

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]

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

Bibliography

Notes and References

1. https://paleobiodb.org/classic/displayStrata?geological_group=&formation=Anzaldo&group_formation_member=Anzaldo Anzaldo Formation
2. Emig & Herrera, 2006
3. Gagnier et al., 1996
4. Pradel et al., 2007
5. Branisa, 1965