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Ice divide migrations
 Discovery that the beds of former ice sheets (ie whole of Canada) contain a complex and palimpsest record of former ice flow that can be used to reconstruct the flow geometry and centres of mass of the ice sheets and how they evolved through time. This overturned the existing paradigm that viewed landforms as simply recording a single timeslice of activity or just retreat patterns.
I have made reconstructions for the ice sheets that covered whole of Canada, for Quebec, and for Ireland, and along with collaborators are currently reconstructing ice sheet dynamics in Arctic Russia and Ireland. It is now widely known that the centres of mass (ice divides) may migrate considerable (~1000 km) distances during growth and decay.
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