When glaciers retreat during warmer periods, they leave behind ridges of sediment.
Sources
- Ice Age - Definition & Timeline (history.com)
- https://geo.libretexts.org/Courses/University_of_California_Davis/GEL_109:_Sediments_and_Strata_(Sumner)/Textbook_Construction/Glacier_Deposits (geo.libretexts.org)
- https://www.antarcticglaciers.org/glacial-geology/glacial-landforms/glacial-depositional-landforms/moraine-types/ (antarcticglaciers.org)
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