Erratics

Erratics from outwith the plateaux margins indicate ice cover and fingerprint the ice provenance as ice sheet rather than local. Local, within-plateau erratic transport must be treated with caution as it may indicate either ice sheet or plateau-centred ice cover. Only in favourable situations would the erratic dispersal pattern indicate a radial drainage pattern and thus local ice cover. It is more likely that the orientation of erratic trains have to be compared to other ice flow indicators in order to establish the ice source.

may be deposited in ice or moraine-dammed lakes and in overdeepened basins. When outlet glaciers terminate in standing water, ice-contact deltas and/or grounding-line fans indicate ice-marginal locations (Evans et al., 2002).

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