Laurentian Shield

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Determinants of temporal coherence in the satellite-derived 1987 – 1994 ice breakup dates of lakes on the Laurentian Shield.

River and lake ice in the Arctic 2009
The thin soil of the Laurentian Shield, left after Ice Age glaciers scraped off the topsoil, has proved suitable for aerial seeding, as have the coarse sands of outwash plains.

3 Canadian Experience 1981