In geology, relating to the Gelasian Age, a division of geological time in the Pleistocene epoch spanning approximately 2.6 to 1.8 million years ago.
From Gela, a town in Sicily, + '-ian' (adjective suffix). The geological age is named after the location where rocks from this period were first studied and defined.
The Gelasian Age is when Earth decided to get serious about ice—this period saw the first major glaciation of the Northern Hemisphere, fundamentally reshaping how the planet looked.
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