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Cover-subsidence type of sinkholes.

By Water Science School
Diagram showing cover-subsidence type of sinkholes.
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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.

 

Sources/Usage

Public Domain.

Sinkholes, west-central Florida
PDF file.