Last Glacial Maximum
Circa 24,000–16,000 BCE; most recent era when ice sheets were at their greatest extent
Last Glacial Maximum
The Last Glacial Maximum (LGM), also referred to as the Last Glacial Coldest Period, was the most recent time during the Last Glacial Period where ice sheets were at their greatest extent between 26,000 and 20,000 years ago. Ice sheets covered much of Northern North America, Northern Europe, and Asia and profoundly affected Earth's climate by causing a major expansion of deserts, alongside a large drop in sea levels. Based on changes in position of ice sheet margins dated via terrestrial cosmogenic nuclides and radiocarbon dating, the growth of ice sheets in the southern hemisphere commenced around 33,000 years ago and maximum coverage has been estimated to have occurred sometime between 26,500 years ago and 20,000 years ago. After this, deglaciation caused an abrupt rise in sea level. Decline of the West Antarctica ice sheet occurred between 15,000 and 14,000 years ago, consistent with evidence for another abrupt rise in the sea level around 14,500 years ago. Glacier fluctuations around...
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