LATE-GLACIAL FLOW PATTERNS, DEGLACIATION, AND POSTGLACIAL EMERGENCE OF SOUTH-CENTRAL BAFFIN-ISLAND AND THE NORTH-CENTRAL COAST OF HUDSON STRAIT, EASTERN CANADIAN ARCTIC

New geomorphic, sedimentologic, and chronologic data are used to recon struct late Quaternary ice-sheet flow patterns, deglaciation, and isos tatic uplift along the largest marine trough connecting the Laurentide Ice Sheet with the North Atlantic Ocean. The Lake Harbour region was targeted for study given its potential to record flow from several ice -dispersal centers. Striations and sediment provenance indicators defi ne flow patterns. Thirty-four radiocarbon dates constrain a chronology of events. Centuries or millennia(?) before deglaciation, a southeast -flowing ice stream impinged on southernmost Big Island, as recorded b y a single striation site and delimited in extent by geomorphic eviden ce of cold-based ice. During the Cockburn Substage (9000-8000 BP), the region was scoured by southward to southwestward flow from an ice cap on Meta Incognita Peninsula, as recorded by 60 striation sites along 200 km of coastline. Carbonate erratics are uncommon in till above the marine limit. Where present, they suggest that southward flow reworke d older drift. At about 8200 BP, the area was deglaciated, and the mar ine limit was established at elevations of 67-141 m above high tide. I ceberg calving and sediment discharge from an ice margin in Ungava Bay , Hudson Bay, or Fore Basin then blanketed the area with limestone-ric h glaciomarine sediment. Afterward, the region experienced slow but su stained emergence. The data revise the maximum lateral extent of a Lat e Wisconsinan ice stream in Hudson Strait and emphasize the extent of a late-glacial ice cap on western Meta Incognita Peninsula.