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Prehistoric Life During the Ordovician Period - ThoughtCo
One of the lesser-known geologic spans in the earth's history, the Ordovician period (448 to 443 million years ago) didn't witness the same extreme burst of evolutionary activity that characterized the preceding Cambrian period; rather, this was the time when the earliest arthropods and vertebrates expanded their presence in the world's oceans.
Ordovician Period Information and Facts | National Geographic
Learn more about the time period that took place 488 to 443 million years ago. During the Ordovician period, part of the Paleozoic era, a rich variety of marine life flourished in the vast seas...
Ordovician Period | Major Events, Extinction, & Facts | Britannica
Ordovician Period, in geologic time, the second period of the Paleozoic Era. It began 485.4 million years ago and ended 443.8 million years ago. The interval was a time of intense diversification (an increase in the number of species) of marine animal life in what became known as the Ordovician radiation.
Ordovician Period summary | Britannica
Ordovician Period, Interval of geologic time, 485.4–443.4 million years ago, the second oldest period of the Paleozoic Era. It follows the Cambrian and precedes the Silurian Period. During the Ordovician, many of the landmasses were aligned in the tropics.
Ordovician - Wikipedia
The Ordovician (/ ɔːr d ə ˈ v ɪ ʃ i. ə n,-d oʊ-,-ˈ v ɪ ʃ ən / or-də-VISH-ee-ən, -doh-, - VISH-ən) is a geologic period and system, the second of six periods of the Paleozoic Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period 485.4 Ma (million years ago) to the start of the Silurian Period 443.8 Ma.
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