Depositional landforms of a Glacier Flashcards
What are the two defining types of glacial erosion?
Lodgement till (deposited by an actively moving Glacier) and Ablation till (deposited at the snout of a Glacier).
What is a Drumlin?
A smooth oval shaped hill typically having a steeper ‘Upstream’ end and a gentle ‘Downstream’ end.
How are Drumlins formed?
When the ice within a Glacier gets overloaded with debris large amounts of deposition occurs around the base.
What is an Erratic?
A large boulder or rock deposited within an area of differing geology.
What is a Moraine?
Moraines are lines or mounds of material deposited by a Glacier.
How are Terminal moraines formed?
When material is deposited at the furthest extent of the Glacier.
How are Recessional moraines formed?
A moraine formed along the length of a valley, similar to a terminal moraine, however it does not show the furthest extent of the Glacier.
how are Push moraines formed?
During cooler climates, when a glacier advances it may push a previously deposited moraine into a mound.
What is a Till plain?
This is generally an area of very flat, wide relief created beyond a terminal moraine filled with gravels, tills and sands.
