GG282 Lecture Notes - Lecture 10: Rogen Moraine, Terminal Moraine, Moraine

Ground moraine (till plain) is not a ridge, it is an area of low relief comprised of glacial till. Terminal moraine (used to denote the furthest advance in a sequence of end moraines ridge) Recessional moraine (used to denote end moraines that are inside the terminal position) Sediments (mostly till) transported to margin and deposited. Wide belt of rolling to hummocky terrain with numerous swales (kettles) and mounds (kames) Comprised of till, ice contact and glaciofluvial materials. Supraglacial sediment accumulates (when ice flow velocities are low) Meltwater mobilizes flow tills and produces glaciofluvial deposits. Discontinous ridges, transverse to the direction of ice flow, crescentic shape. Sediments deposited in shear planes near ice margin (fig 7. 4) Ice contact features are comprised of water transported and deposited sediments (glaciofluvial sediments) Ice contact sediments may show deformation (folding etc. ), may be less well sorted and also incorporate glacial till. Lecture 10 page 1 sorted and also incorporate glacial till.