Youth Stage
- This stage is marked by the inward cutting activity of ice in a cirque.
- Aretes and horns emerge in this stage.
Mature Stage
- The valley glacier gets transformed into a trunk glacier and hanging valleys start emerging.
- The opposite cirques come closer and the glacial trough acquires a stepped profile that is regular and graded.
Old Stage
- The emergence of a ‘U’-shaped valley marks the beginning of old age.
- An outwash plain with features such as eskers, kame terraces, drumlins, kettle holes, etc. is a prominent development.
- The opposite cirques coalesce and the summit heights are greatly reduced. Mountain tops become rounded.
