GEOL 107 Lecture Notes - Lecture 3: Plate Tectonics, Oceanic Crust, Continental Drift
30 Sep 2017
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Lecture 3 - plate tectonics: how the earth works. We tend to think of the earth as fixed and immobile ( terra firma ), and until relatively recently this was the view of virtually all geologists as well. Ocean basins were regarded as permanent features of the earth, and mountains were considered analogous to the wrinkles that form on the skin of a dried-out apple. The major unifying theme in earth science (equivalent in impact to evolution in biology): continental drift - an idea before its time. Most of the evidence at the time was from the. Southern hemisphere, and that is where the few supporters of the concept of continental drift were located. 3. 1): remarkable fit" of the continents, especially east south america and west africa, distributions of late paleozoic and early mesozoic fossils through south america, africa, India, antarctica, and australia suggesting that they were combined into the megacontinent.
