During the last glaciation the Cordilleran Ice Sheet covered the upper course of the Columbia River and part of the Columbia Plateau. A large ice-dammed lake called Glacial Lake Missoula was formed in Montana, when an ice lobe plugged a valley
in Idaho. Once the water level in the ice lake had risen to a certain height the ice dam collapsed and draining of the ice lake resulted in a gigantic flood. A new ice dam was then formed, and after some time a further catastrophic flood occurred. It has
Pollen and macrofossil analyses of two radiocarbon dated lake sediment cores in the upper Peace River district were used to investigate the controversial late-glacial geochronology of the ice-free corridor between the Laurentide and Cordilleran ice
masses. The data support occlusion or near occlusion of Laurentide and Cordilleran ice in the Peace River area during the late Wisconsin. The sediment record began around 12,000 yr BP in the ice-damned and enlarged Boune Lake. An initially open, sedge
Laurentide ice sheet extent inferred from stable isotopic composition (O, C) of ostracodes at Toronto, Canada
The data of this paper show the potential for using isotopic analyses of ostracodes to learn about the isotopic composition of terrestrial meltwater from the Laurentide Ice Sheet. These midcontinent data are especially valuable because they help
to constrain the relationship between ice volume over the North American continent and 18O of seawater.
Glacio-isostatic effects of the Cordilleran Ice Sheet, British Columbia, Canada in Shorelines and isostasy.
This chapter summarizes observed and inferred isostatic effects of Pleistocene ice sheets in British Columbia. At the end of the last glaciation, isostatic depression locally exceeded 250 m. Areas at the periphery of the ice sheet were deglaciated
Ice-sheet glaciation of the Puget lowland, Washington, during the Vashon Stade (Late Pleistocene)
Reconstructed longitudinal profiles for the Puget lobe at its maximum extent, suggest that the ice sheet may have been in a nearequilibrium state at the glacial maximum. Progressive northward retreat from the terminal zone was accompanied
by the development of ice-marginal streams and proglacial lakes that drained southward during initial retreat, but northward during late Vashon time. Relatively rapid retreat of the Juan de Fuca lobe may have contributed to partial stagnation of the northwestern part
of the Puget lobe. Final destruction of the Puget lobe occurred when the ice retreated north of Admiralty Inlet. The sea entered the Puget lowland at this time, allowing the deposition of glacial-marine sediments which now occur as high as 50 m altitude
Importance of the regelation process to certain properties of basal tills deposited by the Laurentide ice sheet in Iowa and Illinois, USA
Recent stratigraphic studies have characterized the sequence and nature of tills deposited in Iowa and Illinois by Quaternary Laurentide ice sheets. Basal tills within the sequence are each dominated by matrix-size materials and exhibit uniform
Seismic profiles across the southwest end of Jeffreys Ledge, a bathymetric high north of Cape Ann reveal two end moraines, which represent fluctuations of the ice front during overall retreat of Laurentide ice from the Gulf of Maine and New England.