UIS Commission on Karst Hydrogeology and Speleogenesis
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Glossary

Glossary of Karst and Cave Terms

pinnacles
These are a particularly mature form of karren. The side walls are grikes with Rinnenkarren cutting across one another to form sharp edges and peaks that can reach several meters in height. Generally, pinnacles need a long period time to form. They are common in the tropics and can attain great sizes [3]. Often, they are covered. See also debris karren.