In 1994, a small collapse feature appeared in Paleozoic carbonates near La Posta Quemada Wash in Colossal Cave Mountain Park. Over the past 24 years, that feature has grown into a moderate-sized opening to a larger sinkhole below. AZGS geologist Joe Cook worked with several others to apply microgravity, electrical resistivity, and LiDAR methods to constrain the size of the void. The results were mixed, but there is clearly a sizable void or partial void associated with the La Posta Quemada sink. This picture shows the makeup of material at the opening to the sinkhole. You can see the results of the sinkhole study here: http://repository.azgs.az.gov/uri_gin/azgs/dlio/1893
Photographer: Joseph Cook
Photo Location Accuracy: Approximately Located
Photo Tags: Colossal Cave Mountain Park, sinkhole, sink, geologic hazard, carbonate, Paleozoic, Lidar, microgravity