Surveys for a proposed hydroelectric dam, disclosed extensive deposits of late Pleistocene lacustrine clay in the valleys of the Churchill and Reindeer Rivers. The presence of montmorillonite in these clays and the topographic configuration suggest continuous connection to the main body of Glacial Lake Agassiz. The presence of till layers above the lacustrine deposits is explained by subaqueous slumping rather than readvance of the glacier, which retreated from this area between 10 000 and 9 000 years ago.Des relevCs kcents pour la construction d'un barrage hydrdlectrique ont mis a jour d'importants dCp8ts d'argile lacustre datant de la fin du Pliistocbne dans les valleesdes rivibres Churchill el Reindeer. La pksence de montrnorillonite dans ces argiles el la configuration topographique laisgent supposer une continuit6 avec la masse principale du lac glaciaire Agassiz. La pksence de couches dr till au-dessus des ddp6ts lacustres s'explique par effondrement subaquatique plutbt que par une nouvelle avance du glacier qui s'est retire de cette region il y a 10 000 ou 9 000 an?.
[Twduit par le journal]Can.
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