Silurian Period

in geologic time, the third period of the Paleozoic Era. It began 443.7 million years ago and ended 416 million years ago, extending from the close ... [9 related articles]
Found on http://www.britannica.com/eb/a-z/s/95

Silurian period

One of the six periods of the Mesozoic era. The Silurian period spans the time between the Ordovician and the Devonian, about 443 to 417 million years ago. During the Silurian, coral reefs first appeared and fishes underwent rapid and important evolution. Jawless fish became widespread, and freshwat...
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Silurian period

Silurian period (siloor'ēun, sī–) [from the Silures, ancient tribe of S Wales, where the period was first studied; named by the British geologist R. I. Murchison], third period of the Paleozoic era of geologic time (see Geologic Timescale, table) lasting from 405 to 435 million...
Found on http://www.infoplease.com/ce6/sci/A0845248.html

Silurian Period

Period of geological time 439–409 million years ago, the third period of the Palaeozoic era. Silurian sediments are mostly marine and consist of shales and limestone. Luxuriant reefs were built by coral-like organisms. The first land plants began to evolve during this period, and there were many ostracoderms (armoured jawless fishes). The ...
Found on http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0007784.html

Silurian Period

The geological time period of the Paleozoic Era following the Ordovician, between 435 and 395 millio
Found on http://www.superglossary.com/Glossary/Science/Biology/
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