Ice sheets approach maximum extent before the LGM peak
Labels: Ice sheets, Last GlacialClimate pressures intensified as ice sheets expanded toward their maximum positions. A major synthesis describes ice-sheet growth to maximum positions as occurring roughly 33.0–26.5 thousand years ago, with many ice sheets near their maximum from about 26.5–19/20 thousand years ago. These environmental changes affected where Gravettian groups could live, pushing settlement choices toward favorable refuges and resource zones.