(a ) An accumulation of broken river ice lodged in a narrow or obstructed part of a channel; it frequently produces local floods during a spring breakup. Cf:ice gorge. (b) An accumulation of large fragments of lake ice or sea ice thawed loose from the shore during early spring and subsequently piled up or blown against the shore by the wind, often exerting great pressures. Neuendorf, K.K.E., Mehl, J.P., Jr., and Jackson, J.A., eds., 2005, Glossary of Geology: American Geological Institute, 799 p.
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