The Ordovician is a geologic period and system, the second of six of the
Paleozoic Era, and covers the time between 485.4 and 443.8 million years ago.
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
Learn about the Ordovician period and get information, facts, and more about
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 ... In geologic time, the second period of the Paleozoic Era. It began 485.4 million
years ago, following the Cambrian Period, and ended 443.8 ...
During the Ordovician ancient oceans separated the barren continents of
Laurentia, Baltica, Siberia and Gondwana. The end of the Ordovician was one of
Ordovician Climate and Plate Tectonics During the Ordovician, tectonic activity
occurred in New England and the British Isles as North America moved toward ...
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 ...
World Paleogeography and Paleoclimate: From the Early to Middle Ordovician,
the earth experienced a milder climate. Siberia and Baltica were separate, and ...
Ordovician Environment. During the Ordovician Period, the surface of the earth
was dramatically different than it is today. Nearly all life on earth was in the ...