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 ... Numerical models of the Ordovician atmosphere estimate that levels of carbon
dioxide were several times higher than today. This would have ...
Ordovician Climate and Plate Tectonics During the Ordovician, tectonic activity
occurred in New England and the British Isles as North America moved toward ...
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 ...
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 period [from the Ordovices, ancient tribe of N Wales], second period of
the Paleozoic era of geologic time (see Geologic Timescale ,...
During the Ordovician ancient oceans separated the barren continents of
Laurentia, Baltica, Siberia and Gondwana. The end of the Ordovician was one of