The Ordovician is a geologic period and system, the second of six periods of the
Paleozoic Era. The Ordovician spans 41.2 million years from the end of the ...
The Ordovician Period lasted almost 45 million years, beginning 488.3 million
years ago and ending 443.7 million years ago.* During this period, the area north
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prehistoric periods from National Geographic.
During the Ordovician Life expanded in diversity tremendously. There were
extensive reef complexes in the tropics. The early Ordovician was thought to be
Sep 29, 2015 ... Ordovician Period, in geologic time, the second period of the Paleozoic Era. It
began 485.4 million years ago, following the Cambrian Period, ...
The Ordovician Period is the second period of the Paleozoic Era. This important
period saw the origin and rapid evolution of many new types of invertebrate ...
Ordovician Life Metazoan invertebrates dominated Ordovician life. While far less
famous than the Cambrian Explosion, the Ordovician encompassed a massive ...
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During the Ordovician ancient oceans separated the barren continents of
Laurentia, Baltica, Siberia and Gondwana. The end of the Ordovician was one of
The Ordovician Period is the second period of the Paleozoic Era. The Ordovician
Period began about 490 million years ago and lasted for about 47 million ...