in geologic time, the second period of the Paleozoic Era. It began 488.3 million years ago, following the Cambrian Period, and ended 443.7 million ... [6 related articles]
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http://www.britannica.com/eb/a-z/o/28
(pronounced or-da-VISH-ee-en) The Ordovician Period lasted from 505 to 438 million years ago. Primitive plants appear on land, as do the first corals, primitive fishes, seaweed and fungi. Graptolites, bryozoans, gastropods, bivalves, and echinoids also appear. There were high sea levels at first, then global cooling and glaciation, and extensive vo...
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Period of geological time 510–439 million years ago; the second period of the Palaeozoic era. Animal life was confined to the sea: reef-building algae and the first jawless fish are characteristic. The period is named after the Ordovices, an ancient Welsh people, because the system of rocks formed in the Ordovician period was first...
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https://www.encyclo.co.uk/local/21221
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