EESA06H3 Lecture 10: Lecture 10
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This is what we do with continents. y oldest is a landmass we call arctica. Ga is for billions of years ago. y then we add more crust. Then rodinia. y abundant life evolves at that time. y as a guiding principle, a+b+c. Eastern maritime. y shield is brown rock. y a+b+c is the core of north america. Lots of blue and lime green, which are wrapped around that core. y blue area on right is appalachian belt. y that is added with maritime canada during the various collisions that built. Pangaea. y then we see a wide belt on the west, which was added when pangaea broke. y tectonics theory in the late 60s. Continents have moved from the equator to the north pole. This map doesn t mean that much. y zircons, which we use for uranium, lead dating. 2. 7 billion year old zircons. y this technique is cheap to do age determinations.
