liustikujõgede suubumisel jääjärves kuhjunud kruusast ja liivast koosnev, ümbritsevast alast kõrgemale ulatuv lainja pinnaga kaldtasandik, delta deposited in the proglacial lake by glacial rivers. Is a plain above surrounding terrain consisting of sand, gravel, pebbles and even boulders with the thickness of several tens of meters; having typically slightly inclined and undulating plain surface and steeply inclined forset beds dipping between 10-30deg.