Glossary of Karst and Cave Terms
(England; sometimes spelled shackhole.) 1. Term used mainly by cavers to indicate a doline, especially one formed by subsidence. 2. Hole formed by solution, subsidence, and compaction in loose drift or alluvium overlying beds of limestone . 3. Small subsidence or suffosion doline formed in the glacial till overlying limestones in the northern Pennies. See jama.