Cover-subsidence type of sinkholes.
Detailed Description
Cover-subsidence sinkholes
Cover-subsidence sinkholes tend to develop gradually where the covering sediments are permeable and contain sand. In areas where cover material is thicker or sediments contain more clay, cover-subsidence sinkholes are relatively uncommon, are smaller, and may go undetected for long periods.
Details
Image Dimensions: 1519 x 449
Location Taken: FL, US
Sinkholes, west-central Florida
PDF file.