Silurian
Silurian
Silurian (/sɪˈlʊəriən/; from Latin Silures, a Celtic tribe) is a geologic period and system spanning 24.6 million years from the end of the Ordovician period, at 443.8 million years ago (Mya), to the beginning of the Devonian period, 419.2 Mya. The Silurian is the shortest period of the Paleozoic Era. 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 several million years.
Etymology
The term "Silurian" was first proposed in 1835 by Roderick Murchison, a British geologist, from the name of the Silures, an ancient Celtic tribe that once lived in south Wales, where rocks of this age were first studied.
Pronunciation
The term "Silurian" is pronounced as /sɪˈlʊəriən/.
Related Terms
- Geologic Time Scale: A system of chronological dating that relates geological strata to time.
- Paleozoic Era: The earliest of three geologic eras of the Phanerozoic Eon, spanning from 541 to 252.17 million years ago.
- Ordovician: The second geologic period of the Paleozoic era, following the Cambrian period and succeeded by the Silurian period.
- Devonian: The fourth period of the Paleozoic Era, following the Silurian period and preceding the Carboniferous period.
External links
- Medical encyclopedia article on Silurian
- Wikipedia's article - Silurian
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