In case of the termination of the last glacial cycle, the retreat of continental ice sheets in the Northern hemisphere began about 20, 000 calendar years ago.
12.
It has been suggested that today's Neotropical rainforests are the result of environmental changes brought about by Quaternary glacial cycles ( i . e . the recent ice age ).
13.
Furthermore, these biological fluctuations were in harmony with a 41, 000-year cycle of variations in the tilt of Earth's axis relative to the sun that are believed to regulate glacial cycles.
14.
For a long time it was the only core to cover several glacial cycles; but in 2004 it was exceeded by the EPICA core, which whilst shallower, covers a longer time span.
15.
There have been at least 17 complete interglacial-glacial cycles since about 1.77 million years ago, and perhaps as many as 44 interglacial-glacial cycles since the beginning of the Pleistocene about 2.58 million years ago.
16.
There have been at least 17 complete interglacial-glacial cycles since about 1.77 million years ago, and perhaps as many as 44 interglacial-glacial cycles since the beginning of the Pleistocene about 2.58 million years ago.
17.
They found that the sea level changes due to Pliocene and Pleistocene glacial cycles changed the area of continental shelves which then disrupted the sulfur processing, lowering the concentration of sulfate in the sea water.
18.
According to Ruddiman, beginning about 900, 000 years ago the earth has begun to go through regular glacial cycles in which glaciers or ice have covered approximately one quarter of the earth s total surface.
19.
Dating of moraines on western Tongariro show that valley glaciers were present at several times during the last glacial cycle, before melting away at the end of the Last Glacial Maximum approximately 18, 000 years ago.
20.
Schmidt et al . 2011 ) allowing for a reliable correlation of loess / palaeosol sequences for at least the last two interglacial / glacial cycles throughout Europe and the Northern Hemisphere ( Frechen 2011 ).
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