Collapse of the Hudson Bay ice center and glacio-isostatic rebound

An ice-unloading model for Hudson Bay consistent with the rebound history of the Ottawa Islands requires collapse of the central dome of the Laurentide Ice Sheet between 12,000 and 10,000 B.P. Hudson Bay was then filled by a shallow ice shelf with ice streaming into the bay from ice centers located over Keewatin and Labrador. The observed rebound is fully consistent with a uniform mantle viscosity of 10²² P.