Before revision: wide|Johnson's Shut-Ins panorama A shut-in is a type of riverine geologic formation found in the Ozarks where a stream has come into contact with erosion resistant bedrock, resulting in rock formations within the stream channel that form a complex of pools, rivulets, rapids and plunge pools.
After revision: wide|Johnson's Shut-Ins panorama A shut-in is a type of rock formation found in Ozarks streams where they carve through a mountain range, causing a complex of pools, rivulets, rapids and plunge pools.