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During the Late Pleistocene, the Laurentide ice sheet reached from the Rocky Mountains eastward through the Great Lakes, into New England, covering nearly all of Canada east of the Rocky Mountains. [8] Three major ice centers formed in North America: the Labrador, Keewatin, and Cordilleran. The Cordilleran covered the region from the Pacific ...
During the 2.5 million years of the Pleistocene, numerous cold phases called glacials (Quaternary ice age), or significant advances of continental ice sheets, in Europe and North America, occurred at intervals of approximately 40,000 to 100,000 years.
A map of Pleistocene lakes in the Great Basin of western North America, showing the path of the Bonneville Flood along the Snake River. The Pinedale (central Rocky Mountains) or Fraser (Cordilleran ice sheet) glaciation was the last of the major glaciations to appear in the Rocky Mountains in the United States.
Map of Pleistocene lakes in the Great Basin of western North America. Chronology of Lake Bonneville. “Calibrated ages” are approximate calendar years before present (A.D. 1950). Elevations are adjusted for differential isostatic rebound in the basin.
Evidence for the Quaternary glaciation was first understood in the 18th and 19th centuries as part of the scientific revolution.Over the last century, extensive field observations have provided evidence that continental glaciers covered large parts of Europe, North America, and Siberia.
The Cordilleran ice sheet was a major ice sheet that periodically covered large parts of North America during glacial periods over the last ~2.6 million years. Extent [ edit ]
Lake Agassiz (/ ˈ æ ɡ ə s i / AG-ə-see) was a large proglacial lake that existed in central North America during the late Pleistocene, fed by meltwater from the retreating Laurentide Ice Sheet at the end of the last glacial period. At its peak, the lake's area was larger than all of the modern Great Lakes combined. [2]
Pleistocene: North America: US: Texas: Tanis: Hell Creek Formation: End of Cretaceous/start of Cenozoic (65.76 Ma ± 0.15 Mya) North America: United States: