EESA06H3 Lecture 9: EESA06 – Lecture 9 (Canada’s Geologic Journey
16 Oct 2018
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Ca(cid:374)ada"s geological history is a lo(cid:374)g jour(cid:374)ey i(cid:374) 5 parts (slide 2) North american continent has grown in 5 stages: arctica (2. 7 ga, crust added to north america, phases of expansion, nena (1. 8 ga, crust added to north america, phases of expansion, rodinia (1. 0 ga) The first 3 (arctica, nena and rodinia) = craton (canadian shield) not directly equivalent but those 3 phases saw the building of the canadian shield; it still underlies a lot of the us and. Greenland because it was a part of canada until 80 million years ago and broke off when the. Atlantic started to open: core of the continent, the old core of north america and then later stages 4 and 5 were added. 4 (pangaea assembly) added much of eastern canada, maritime canada, the atlantic provinces most of the crust that underlies those were added during pangaea assembly. 5 (pangaea breakup) added western cordillera, british columbia, yukon, alaska, much of.
