| During the Late Quaternary both the Hudson and New Quebec Ice Domes that covered the southeastern Hudson Bay region began to recede, the region was flooded by glacial Lake Ojibway, water level dropped by up to 200m and the area was invaded by the Tyrrell Sea. This was followed by glacio-isostatic rebound. The onshore and offshore sediments have preserved the evidence of these events.;There are four distinct morphological zones of the till/ice contact (Unit 2) sediments. Glaciolacustrine/marine is present throughout most of the study areas as a conformable drape over the bedrock and till/ice contact sediments, these sediments do not interfinger with the till. An ice margin position is observed at an isolated location near the northern moraine. Similar well banded rhythmite sequences are present throughout Hudson Bay and into western Hudson Strait. The one condition that all these widely spaced occurrences have in common is that where micropaleontological analysis has been completed the zone is virtually barren.;The postglacial/recent sediments conformably overlie and grade into glaciolacustrine/marine sediment unit. Sediments of this unit display considerable horizontal and vertical variability. Deposition of this unit is influenced by tidal currents, wave base reworking and sediment failure. (Abstract shortened by UMI.). |
