Glacial Deposition A2

Material deposited by glaciers is collectively termed GLACIAL DRIFT – It can be sub-categorised into: DIRECT DEPOSITION TILL - Glacial deposits, unstratified and unsorted material (boulder clay) – large fragments of rock of all sizes and shapes randomly mixed together. Can be divided into: 1. lodgement till – deposited at base of glacier due to basal melting – material is smeared onto the underlying rock due to the pressure of the ice as it continues to move 2. ablation till – material deposited as the ice melts away (coarser than lodgement till 2. INDIRECT DEPOSITION a. FLUVIOGLACIAL – picks up load once carried by ice (often then carried beyond limits of glacier – sorted and stratified by the action of water b. ICE – CONTACT STRATIFIED DRIFT – partly sorted by water – roughly stratified – deposited in vicinity of melting ice. GLACIAL DEPOSITION

Features of Glacial Deposition: Till Deposits ,[object Object],[object Object],[object Object],[object Object]

DRUMLINS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

A Drumlin Field – also known as a Drumlin Swarm – typical “Basket of Eggs” topography

Western Alberta, Canade ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Examples of Drumlins : Hellifield, Ribblesdale – North Yorkshire – Swarms 40m high, 50-500m long – may be the result of ice sheets coming down from the Lake District, overloaded – change of gradient on the lowlands may have caused the ice to deposit the drumlins here. Other examples: New York State (USA) – largest drumlin field – 10,000 drumlins! Eden Valley - Cumbria

Stoss End Lee Slope Direction of Ice Flow

Lateral Moraine ,[object Object],[object Object],MORAINES

Medial Moraine ,[object Object],[object Object],[object Object]

Terminal Moraine ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Recessional Moraine ,[object Object],[object Object],[object Object],[object Object]

Push Moraine ,[object Object],[object Object]

ERRATICS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

TILL PLAINS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Reference: All photographs used for educational use only – sourced from google images.

Glacial Deposition A2

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Glacial Deposition A2