Lobate Stacked Moraines: Lake Melville, Labrador

In Lake Melville, Labrador (Fig. 1), Quaternary sedimentary deposits reflect retreat of the Laurentide Ice Sheet during the early Holocene, based on acoustic properties of sediment packages, distribution (isopach) patterns, and information from dated cores. Coastal gravel pits from isostatically-raised moraines have rounded boulders >10 m in diameter, and the large volume of deposited sediment together suggest a high discharge cf water through the ice sheet and into the Lake. During ice-retreat, there were a four small (a few kilometres) ice advances. Seismic units 3/4, 5, 7 and 9 appear as evidence of readvances of the ice margin. Stacked moraines formed and account far over 400 m of glacimarine sediments (Fig. 2).