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Very large floes, locally called "battures", are sometimes encountered in the northwestern Gulf of St. Lawrence in March. These are dislodged fragments of the fast ice which forms over shoals along the south shore of the Estuary and which have been subsequently dislodged by spring tides during mild spells. Battures are noted for their size, roughness, and dirtiness, and may carry a very thick snow cover that makes them very difficult to penetrate. They constitute a severe hindrance and a hazard to navigation.
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