During an ice age, ice and glaciers spread outward over large regions from the north and south poles. When moving around, glaciers leave deep scratches on what would have been smooth rock and deposit sediments that can be identified and dated.
Paleozoic Glaciation (ancient glaciation), which took place approx. 300 million years ago, left marks on rocks that are now on several continents that are all far away from the poles like present day arid Africa. the various locations that glaciologists have found the same rock deposits, dating to the same ages, make no logical sense unless the continents together as Wegener proposed. When this is done, locations and latitudes of the Paleozoic Glaciation fall into place.
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