AZGS' Joe Cook published a 16-p. report on a sinkhole in the La Posta Quemada wash in Colossal Cave Mountain Park, Pima County, Arizona.
You can retrieve the online PDF here: http://repository.azgs.az.gov/uri_gin/azgs/dlio/1893
Photographer: Joseph Cook
Photo Location Accuracy: Approximately Located
Photo Tags: geologic hazard, Escabrosa Formation, Limestone, Karst, Holocene, Colossal Cave 
