Chapter

Deposited by ice

David J. A. Evans

in Glaciation: A Very Short Introduction

Published in print October 2018 | ISBN: 9780198745853
Published online October 2018 | e-ISBN: 9780191808227 | DOI: https://dx.doi.org/10.1093/actrade/9780198745853.003.0006

Series: Very Short Introductions

Deposited by ice

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There are two types of primary glacial sediment created by glacier beds acting as shearing zones within which a subglacial deforming layer is developed: till and glacitectonite. ‘Deposited by ice’ explains how these deposits represent a continuum of materials, the products of the various stages of sediment mixing creating diamicton. Where a glacier acts to deform and gradually mix its substrate it will create a melange or glacitectonite. At the highly deformed end of the spectrum, the material is close to being fully homogenized into a diamicton and at this point it becomes a subglacial till. Erratics—boulders carried by glacier ice, often over long distances—are also described.

Keywords: diamicton; glacial; Ice Age; Laurentide ice sheet; sediment; till; tunnel valley

Chapter.  2774 words. 

Subjects: Physical Geography and Topography

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