Into the freezer: Cenozoic glaciation

The surface on which the Sirius Group is exposed on Roberts Massif (see light area, lower right) is faulted, disrupting the regularity of former ice-flow patterns.The precise age of faulting is unknown, but probably lasted into Early Quaternary time. Numerous Quaternary ice-marginal moraines, comprising angular debris, are superimposed on this surface.

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