This site explains the events during the Paleozoic era that led up to the formation of the Pangaea supercontinent in the Mesozoic era. The existence in the Paleozoic era of the supercontinent Gondwanaland, the continents Laurentia and Baltica, and smaller continental masses are explained as well as the later collisions which created mountains by folding of the Earth's crust, (orogenies) such as the Acadian, Appalachian, Urals, and Laramide orogenies.
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