Covered or having been covered by glaciers or ice sheets:a glaciated valley...
None of the streams draining upland areas of the Southeast were glaciated during Pleistocene ice ages or inundated by Cretaceous seas during interglacial periods.
The region is adjacent to the driftless area, and was glaciated during the Wisconsin glaciation.
The two maps are genetically related, but very different, in some ways loosely comparable to the ‘Solid’ and ‘Drift’ geological maps of a heavily glaciated area.
Origin
Mid 19th century: past participle of obsolete glaciate, from Latin glaciare 'freeze', from glacies 'ice'.