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huronian glaciation
The Huronian glaciation (or Makganyene glaciation) was a glaciation that extended from 2400 million years ago to 2100 million years ago, during the Siderian and Rhyacian periods of the Paleoproterozoic era. The Huronian glaciation followed after the Great Oxygenation Event (GOE), a time when increased atmospheric oxygen decreased atmospheric methane.
It is the oldest known ice age, occurring at a time when in biological sense, only simple, unicellular life existed on Earth.
== Name origin ==
This geological era was named from geologic findings in the Lake Huron region in North America where three separate horizons of glacial deposits are separated by non-glacial sediment.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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