Debris Flashcards
What is englacial debris?
Debris buried within the ice.
What is ground moraine?
Found at the bottom of the glacier.
What is lateral moraine?
Found on the sides of the glacier.
What is medial moraine?
Found in the middle of the glacier.
What is till?
An unsorted mixture of rocks, clay and sand that was mainly transported as supraglacial or englacial debris and deposited when the ice melted.
What is till useful for?
To reflect the character of the rocks over which the ice has passed eg. rocks from the Lake District (sharp granite) are found in the till of south Lancashire.
What is subglacial debris?
Rockfalls on the valley side are transported on the surface of the glacier.
Also;
Material found at the base of the glacier is known as subglacial and may include rock fragments that have fallen down crevasses and material eroded at the base.
What is lodgement till?
Subglacial material that was deposited by the actively moving glacier. Can form a drumlin.
What is ablation till?
Produced at the snout when the ice melts. Terminal, push and recessional moraines are features of ablation till.
