Brimble Pit and Cross Swallet Basins, Geological conservation area in Mendip Hills, Somerset, England
Brimble Pit and Cross Swallet Basins comprise two adjacent karstic basins covering about 154 hectares with numerous sinkholes and sediment-filled depressions. The landscape shows the dramatic geological features created by underground water movement over thousands of years.
The area was designated as a protected site in 1951 due to its geological importance. Archaeological work in the early 1990s uncovered pottery and stone tools from prehistoric times within the cave systems.
The site forms part of Cook's Fields Nature Reserve, managed by Somerset Wildlife Trust for conservation purposes. Visitors can see how the landscape is actively maintained to protect the geological features that make it distinctive.
The site lies between Wookey Hole and Priddy and can be explored via walking paths that follow the surface features. Visitors should avoid entering the cave systems themselves, as they are unsafe and not intended for public exploration.
Brimble Pit contains an extensive lake sediment floor punctuated by sinkholes at different stages of development. Cross Swallet displays an active sinkhole with preserved rock terraces, revealing how the two basins develop through different geological processes.
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