noting or pertaining to a geologic period of the Paleozoic Era, from 500 million to 425 million years ago, notable for the advent of fish.
the Ordovician Period or System.
Ordovician | Define Ordovician at Dictionary.com
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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
Learn about the Ordovician period and get information, facts, and more about
prehistoric periods from National Geographic.
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, ...
During the Ordovician Life expanded in diversity tremendously. There were
extensive reef complexes in the tropics. The early Ordovician was thought to be
Ordovician Life Metazoan invertebrates dominated Ordovician life. While far less
famous than the Cambrian Explosion, the Ordovician encompassed a massive ...
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 ...
During the Ordovician, a few animals and plants began to explore the margins of
the land, but nothing colonised beyond these beachheads, so the majority of ...