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Stone Orientation and Other Structural Features of Tills in East Yorkshire

Published online by Cambridge University Press:  01 May 2009

L. F. Penny  and
J. A. Catt
L. F. Penny
Affiliation:
Department of Geology, The University, Hull.
J. A. Catt
Affiliation:
Department of Pedology, Rothamsted Experimental Station, Harpenden, Herts.
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Abstract

Macrofabric (stone orientation) and microfabric studies of the four tills exposed in the coastal areas of East Yorkshire indicate that the regional direction of ice movement during both the Saale and Weichsel Glaciations was from north-east to south-west. The Saale (Basement) Till was considerably modified by the advance of ice during the Weichsel Glaciation; in particular, the stones in the Basement were reorientated so that their long axes now lie at right angles to the direction of movement of the Weichsel ice sheet. The fabrics of the three Weichsel tills (Drab, Purple and Hessle) are alike, and it is suggested that all three were deposited from one composite ice sheet. The relationship of vertical joints in the Basement and Drab Tills to directions of ice movement is discussed; those in the Basement possibly originated as ac tension joints inherited from the parent ice, whereas some of those in the Drab are probably conjugate shear joints formed during post-depositional deformation of the till.

Type
Articles
Information
Geological Magazine , Volume 104 , Issue 4 , August 1967 , pp. 344 - 360
Copyright
Copyright © Cambridge University Press 1967

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