moraine lateral moraine ENVO ENVO:00000249 EcoLexicon:lateral_moraine The parallel ridges of till deposited along the sides of an alglacier. The unconsolidated debris is deposited on top of the glacier by frost shattering of the valley walls and from tributary streams flowing into the valley. The till is carried along the glacial margin until the glacier melts. Wikipedia:Lateral_moraine moraine