A sinkhole of unknown extent occurs in the Colossal Cave Mtn. Park near Vail, Arizona. A new report by AZGS’ Joe Cook uses geophysical and drone technologies to decipher the extent of La Posta Quemada Wash sinkhole.
Cook, J.P., 2018, Investigations of the Possible Underground Extent of La Posta Quemada Sinkhole, Colossal Cave Mountain Park, Pima County, Arizona. Arizona Geological Survey Open-File Report OFR-18-01, 19 p, 4 appendices.