What kind of landforms would indicate the prior existence of a continental glacier?

The resulting erosional landforms include striations, cirques, glacial horns, arêtes, trim lines, U-shaped valleys, roches moutonnées, overdeepenings and hanging valleys. U-shaped or trough valley: U-shaped valleys are created by mountain glaciers.

Continental Glaciers - "They are the large piece or sheets of ice after enormous amount of ice is accumulated over the surface of the earth."

Now there are different kinds of land farms but the one that indicates the prior existence of a continental glacier is given below.

Explanation:

U-Shaped Valley - It is one of the feature that is created by the glacier on the surface of land by the process of plucking and abrasion. As the movement of the glaciers widens the V-shaped stream valleys to become U-Shape. The U-shaped valley is the geological formation Characterized by a rounded or flat valley bottom.