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The Quaternary glaciation produced more lakes than all other geologic processes combined. The reason is that a continental glacier completely disrupts the preglacial drainage system . The surface over which the glacier moved was scoured and eroded by the ice, leaving many closed, undrained depressions in the bedrock.
A minor series of glaciations occurred from 460 to 430 Ma, and there were extensive glaciations from 350 to 289 Ma. The Late Cenozoic Ice Age has seen extensive ice sheets in Antarctica for the last 34 Ma. During the last 3 Ma, ice sheets have also developed on the northern hemisphere.
A chronology of climatic events of importance for the Last Glacial Period, about the last 120,000 years The Last Glacial Period caused a much lower global sea level.. The Last Glacial Period (LGP), also known as the Last glacial cycle, occurred from the end of the Last Interglacial to the beginning of the Holocene, c. 115,000 – c. 11,700 years ago, and thus corresponds to most of the ...
The Quaternary Period follows the Neogene Period and extends to the present. The Quaternary covers the time span of glaciations classified as the Pleistocene, and includes the present interglacial time-period, the Holocene. This places the start of the Quaternary at the onset of Northern Hemisphere glaciation approximately 2.6 million years ago .
Violet: Extent of the Alpine ice sheet in the Würm glaciation. Blue: Extent in earlier ice ages. Blue: Extent in earlier ice ages. The Late Pleistocene is an unofficial age in the international geologic timescale in chronostratigraphy , also known as the Upper Pleistocene from a stratigraphic perspective.
The Illinoian Stage is the name used by Quaternary geologists in North America to designate the Penultimate Glacial Period c.191,000 to c.130,000 years ago, during the late Middle Pleistocene (Chibanian), when sediments comprising the Illinoian Glacial Lobe were deposited.
The stage names "Kansan", "Yarmouth", "Nebraskan" and "Aftonian" were later abandoned by North American Quaternary geologists and merged into the Pre-Illinoian stage. [ 9 ] [ 10 ] The Anglian Stage is now correlated with the period of time which includes the Pre-Illinoian B glaciation of North America.
In terms of global ice volume, it ranks as one of the two most extreme glaciations of the Quaternary, on par with MIS 12. [3] [2] However, in terms of sea water temperatures it is a much more modest glaciation, of similar climate intensity to the neighbouring Cromerian glaciations MIS 14 and MIS 18. [3]