Tunnel valley
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A tunnel valley is a U-shaped valley originally cut under the glacial ice near the margin of continental ice sheets such as that now covering Antarctica and formerly covering portions of all continent
New York's Finger Lakes. Lying south of Lake Ontario, the Finger Lakes formed in tunnel valleys.
A figure in Dutch showing the cross-section of a tunnel valley which has been refilled after erosion into bedrock.
A Polish ribbon lake formed in a tunnel valley. Note the variable width and the interruption between segments of the course. There is also evidence of other sediment-filled channels adjacent to this (e.g., two smaller lakes to the right)
Tunnel valley landscape from the island Zealand in Denmark.
Drumlin
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A drumlin is an elongated hill in the shape of an inverted spoon or half-buried egg formed by glacial ice acting on underlying unconsolidated till or ground moraine. The name is derived from the Irish
Drumlins around Horicon Marsh, Wisconsin, in an area with one of the highest concentration of drumlins in the world. The curved path of the Laurentide Ice Sheet is evident in the orientation of the various mounds.
Elongate and forested drumlins south of Puerto Williams, Chile. Flow direction here was at time of formation from west to east (left to right on picture).
Clew Bay in County Mayo, Ireland, is a vast field of semi-submerged drumlins, which are now islands.
Drumlin field in Western New York state, aligned with glacial flow