Evidence of the late Quaternary glaciation is abuntant in the area.  Outwash fans, and pitted outwash plains are common in the northern region of the Champlain Sea.  The flow was dominated by the regional topography causing it to become strongly lobate, and pushing it in a southweasterly direction.  The flow continued until it completely consumed the region with a mass of ice.  It pushed as far south as the western tip of the Lake Ontario basin before it halted and began it's retreat.