Silurian

The Silurian is a major division of the geologic timescale that extends from the end of the Ordovician period, about 443.7 million years ago (mega years ago, mya), to the beginning of the Devonian period, about 416.0 mya (ICS 2004). As with other geologic periods, the rock beds that define the period's start and end are well identified, but the exact dates are uncertain by 5-10 million years. The base of the Silurian is set at a major extinction event where 60% of marine species were wiped out. See Ordovician-Silurian extinction events.

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Geologic timescale: REDIRECT Geologic time scale...

Ordovician: The Ordovician period is the second of the six (seven in North America) periods of the Paleozoic era. It follows the Cambrian period and is followed by the Silurian period. The Ordovician, named after the Welsh tribe of the Ordovices, was defined by Charles Lapworth in 1879, to resolve a dispute bet...

Devonian: Disambiguation: Devonian is also an adjective relating to the English county of Devon or the people there....

Silurian related Images and Photos (experimental)

Life-Forms of the Silurian Era