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Topic%2006_Ordovician

Topic%2006_Ordovician - Ordovician Note where the South...

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Ordovician Note where the South Pole is in late Proterozoic. What does this suggest about glaciation? Sea levels? How did the global climate change? How about sea level?
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Ordovician climate ? Ordovician sea level? What area of Laurentia broke off during the Ordovician? What orogeny resulted from the closure of the Ordovician Iapetus Sea ? What Ordovician orogeny is pictured here? What have the Ordovician pyroclastics weathered to today? Explain the origin of the Ordovician rocks shown here.
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Where was the South Pole at the end of Ordovician time? What happened to life at this time? The Ordovician occurred between about 450 and (400, 500 ) million years ago. A defining characteristic of the Ordovician was the (extinction, diversification )of marine invertebrate Paleozoic Fauna . Like many geologic periods, the Ordovician started and ended with an (diversification, extinction ). The first major Paleozoic ice age occurred at (End Cambrian, End Ordovician, End Devonian ).
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