Lewis A. Land, Charles K. Paull, Brett Hobson; Genesis of a submarine sinkhole without subaerial exposure: Straits of Florida. Geology ; 23 (10): 949–951. doi: https://doi.org/10.1130/0091-7613(1995)023<0949:GOASSW>2.3.CO;2
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A sinkhole has been identified on side-scan sonar images and from near-bottom echo sounder data in the southern Straits of Florida in 575 m of water. Sinkholes are often thought to form exclusively in subaerial environments and for this reason have been used as indicators of sea level. This sinkhole exists within a Quaternary sediment apron in water depths too great to have been subaerially exposed by Neogene sea-level lowstands, thus indicating that sinkholes can develop within the submarine environment.