Forms at the Base of Till Strata as Indicators of Ice Movement

• Published in: Journal of Glaciology
• Main Authors: Ehlers, J., Stephan, H.-J.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Cambridge University Press (CUP) 1979
• Subjects: Journal of Glaciology
• Online Access: http://dx.doi.org/10.1017/s0022143000014325; https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000014325

Abstract The direction of inland ice movement can, in some cases, be reconstructed by a study of the forms at the base of till strata. These forms are “ribs”, which are formed either as slickensides or as a type of negative “flute”; “edges” and “wedges”, which are caused by shearing movements at the base of the ice; or “undulations”, probably created by restricting movements at the base of the ice. These forms appear to be elongated in the direction of ice movement. As these features can easily be measured, they can be used to check, supplement, or replace the results of till-fabric measurements.