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dc.contributor.authorCook, J.P.
dc.date.accessioned2018-11-10T02:48:10Z
dc.date.available2018-11-10T02:48:10Z
dc.date.issued2018-06-11
dc.identifier.citationCook, J.P., 2018, Investigations of the Possible Underground Extent of La Posta Quemada Sinkhole, Colossal Cave Mountain Park, Pima County, Arizonl. Arizona Geological Survey Open-File Report OFR-18-01, 19 p, 4 appendices.
dc.identifier.urihttp://hdl.handle.net/10150/630765
dc.descriptionThe purpose of this investigation is to assess the possible underground extent of a sinkhole in Colossal Cave Mountain Park southeast of Tucson near Vail, Arizona (Figure 1). The sinkhole is located in a low terrace adjacent to La Posta Quemada (LPQ) Wash. In this report the sinkhole is referred to as LPQ sink. LPQ sink has grown in volume and extent since its initial appearance in the fall of 1994 and has undermined a park road used to access La Selvilla campground and picnic area. Park visitors must now detour around the sinkhole into LPQ Wash in order to access the campground. Colossal Cave Mountain Park is a Pima County park currently operated by Ortega National Parks LLC. Fencing and signage prohibiting entrance was installed around LPQ sink to prevent injury to park visitors unaware of the unstable nature of the sinkhole and surrounding area. Unfortunately, LPQ sink has continued to grow in size over the past several years and now extends beyond the fenced area. The Pima County department of Finance and Risk Management contracted with the Arizona Geological Survey (AZGS) in the fall of 2017 to assess the extent of underground voids associated with LPQ sink in order to predict the limits of possible surface collapse. To best delineate the extent of underground voids AZGS employed a combination of surface mapping, detailed surface topography surveys, and geophysical surveys including microgravity and electrical resistivity void mapping.
dc.language.isoen
dc.publisherArizona Geological Survey (Tucson, AZ)
dc.relation.ispartofseriesOFR-18-01
dc.relation.urlhttps://library.azgs.arizona.edu/item/AOFR-1552429219637-2
dc.rightsArizona Geological Survey. All rights reserved.
dc.subjectArizona Geological Survey Open File Reports
dc.subjectEarly Mississippian
dc.subjectHolocene
dc.subjectHistoric
dc.subjectLa Posta Quemada Wash
dc.subjectVail
dc.subjectPima County
dc.subjectRincon Mountains
dc.subjectColossal Cave
dc.subjectEscabrosa Limestone
dc.subjectHorquilla Limestone
dc.subjectConcha Limestone
dc.subjectlimestone
dc.subjecthazard analysis
dc.subjectgeologic hazard
dc.subjectkarst
dc.titleInvestigations of the Possible Underground Extent of La Posta Quemada Sinkhole, Colossal Cave Mountain Park, Pima County, Arizona
csdgm.bounding.west-110.603
csdgm.bounding.east-110.581
csdgm.bounding.north32.0891
csdgm.bounding.south32.0798
dc.description.noteIn May 2018, this report was handed off to Pima County authorities.
dc.description.collectioninformationDocuments in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu.
refterms.dateFOA2018-11-10T02:48:10Z


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