Different types of rocks that surrounds the bedrock of the glacier:

• Drumlins: Drumlins are long tear drop shaped mounds of till that have been smoothed in the direction of the glacier’s flow. Drumlins often occur in groups.
• Eskers: Eskers are ridges made from sand and gravel that were deposited in the bed of a stream that flowed within the glacier.
• The outwash plain: This broad, flat plain is made of particles of sand and gravel that were deposited from streams that flowed from the glacier.
• Erratics: These are boulders that a glacier has carried away from their place of origin.
• End moraine: An end moraine is a broad, rounded ridge of till marking the farthest point of a glacier’s advance.