GEOL 1101 Lecture Notes - Lecture 1: Asthenosphere, Supreme Headquarters Allied Powers Europe, Phanerite
29 Sep 2016
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Edward suess proposed gondwanaland based on fossil evidence from south america and africa. Alfred wegener suggests all continents were once linked pangea (pangea meaning all land, all land was connected) Alexander du toit writes about laurasia in northern hemisphere. Alignment of mountains & coal on both sides of the atlantic ocean. Harry hess discovers the east pacific rise, leading to the discovery of the mid atlantic ridge (the ocean floor spreads) 1960"s : tuzo wilson uses models to explain the magnetic evidence that was piling up and how a spreading model would fit on a sphere. When iron rich magma solidifies, the iron takes on the polarity of the earth"s magnetic field at that point in time. The molecular grains line up and align to the earth"s polarity. This is indication that the ocean floor is moving and spreading. **new ocean crust is created at mid ocean ridges.
