Additional supporting information can be found in the online version of this article at the publisher's web-site.

jqs2667-sm-0001-SuppApp-S1.docx23KAppendix S1. The mechanics of glaciotectonic deformation.
jqs2667-sm-0002-SuppTab-S1.tif415KTable S1. Basic palaeoglaciological and geotechnical parameters calculated for different ice sheet profiles and thicknesses with flattest and steepest ice.
jqs2667-sm-0003-SuppFig-S1.pdf697KFigure S1. Palaeoglaciological model for the thickest-ice scenario and a close-up showing the marginal ca. 1 km with stress components at the point of failure.

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