Mapping History of Glacial Lake from 11.700 to 7.700 years ago
Since the work of Warren Upham many reseachers have studied and debated the extent and evolution of Glacial Lake Agassiz.. A good overview of this work is presented by Thorleifson of the Geological Survey of Canada in his : Review of Lake Agassiz History . This review includes a series of maps depicting the various stages of the Lake. They are are presented here as overlays and tools to study the retreat of the Laurentide ices sheet and the evolution of Glacial Lake Agassiz using Google Earth For more information: http://www.geostrategis.com/p_agassiz.htm and http://www.geostrategis.com

Lake Agassiz 11.700 years ago
Please note! The Glacial lake boundaries in this overlay are rough approximations due to distortions in the overlay (different map projections) and the map generalization used to create these very small scale maps. They illustrate the general extent of the lake in that time period. In many situations the lake would extend beyond these outlines, particularly in low lying areas. Map source is Thorleifson Geological Survey of Canada: Review of Lake Agassiz History http://www.geostrategis.com/p_agassiz.htm

Lake Agassiz 11'500 years before present
Please note Please note! The Glacial lake boundaries in this overlay are rough approximations due to distortions in the overlay (different map projections) and the map generalization used to create these very small scale maps. They illustrate the general extent of the lake in that time period. In many situations the lake would extend beyond these outlines, particularly in low lying areas. Map source is Thorleifson Geological Survey of Canada: Review of Lake Agassiz History http://www.geostrategis.com/p_agassiz.htm

Lake Agassiz 11'200 years before present
Please note! The Glacial lake boundaries in this overlay are rough approximations due to distortions in the overlay (different map projections) and the map generalization used to create these very small scale maps. They illustrate the general extent of the lake in that time period. In many situations the lake would extend beyond these outlines, particularly in low lying areas. Map source is Thorleifson Geological Survey of Canada: Review of Lake Agassiz History http://www.geostrategis.com/p_agassiz.htm

Lake Agassiz 11'100 years before present
Please note! The Glacial lake boundaries in this overlay are rough approximations due to distortions in the overlay (different map projections) and the map generalization used to create these very small scale maps. They illustrate the general extent of the lake in that time period. In many situations the lake would extend beyond these outlines, particularly in low lying areas. Map source is Thorleifson Geological Survey of Canada: Review of Lake Agassiz History http://www.geostrategis.com/p_agassiz.htm

Lake Agassiz 10'900 yeasr before present

Lake Agassiz 9.900 years before present

Please note
The Glacial lake boundaries in this overlay are rough approximations due to distortions in the overlay (different map projections) and the general nature of these very small scale maps. They illustrate only the general extent of the lake in that time period.
http://www.geostrategis.com/p_agassiz.htm

Lake Agassiz 7.700 years ago