Francois Mountains region of southeast Missouri. More than ninety other shut–ins occur within and around the St. Johnson's Shut-Ins State Park in Missouri, with its hard rhyolite and a diabase dike that divert the Black River into many small streamlets following a complex joint system, is the most well known example. The term has an origin in Appalachia, where it was used to refer to a narrow river gorge confined by resistant rock layers. The river becomes unnavigable at shut-ins even by canoe due to the rapids and narrow channels.
Because the rock resists downcutting, streams typically descend at relatively steep gradient through shut-ins, with the downstream terminus of the formation often marked by a very large plunge pool. Shut-ins are inherently confined to a narrow valley or canyon, with the river valley widening out both above and below the formation. The term has an origin in Appalachia.Ī shut-in is a rock formation that carve through a mountain ranges, causing a complex of pools, rivulets, rapids and plunge pools. Origin of shut-in 1 184050, Americanism adj. an oil or gas well that has been closed down. noun a person confined by infirmity or disease to the house, a hospital, etc. (of an oil or gas well) temporarily sealed up.
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