Image is in the public domain as a work of the US Government. Located at N33° 07’ 42.06” W86° 47’ 01.86" in Shelby County, Alabama, USA. Used as Figure 1 in Newton, John G. Development of sinkholes resulting from man's activities in the eastern United States. 1987 US Geological Survey Circular 968, available at https://pubs.usgs.gov/circ/1987/0968/report.pdf USGS attributes photo to T V Stone. Image is available from USGS photo library: https://library.usgs.gov/photo/#/item/51ddc5cae4b0f72b44720f4b Details of the sinkhole collapse are reported on pages 61 to 63 in Sowers, George F. (1996). Building on sinkholes. New York: American Society of Civil Engineers. doi:10.1061/9780784401767. ISBN 0-7844-0176-4.

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