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S22 52 13.71, W67 20 10.78
A co-ignimbrite ash is a cloud of fine ash particles that overrides a pyroclastic density current.The process responsible for the formation of these clouds is call elutriation. The co-ignimbrite deposit overlies the Tara ignimbrite and is capped with dilute flow, surge, and possibly flow deposits. This is the only co-ignimbrite ash deposit ever identified in the central Andes.
Image of the co-ignimbrite ash deposit with Bob for scale.
Close up image of the co-ignimbrite ash deposit with hot sauce for scale.
See Sparks and Walker (1977) for more details