Ordovician
Ordovician
Ordovician (pronunciation: /ɔːrdəˈvɪʃən/) is a geologic period and system, the second of six of the Paleozoic Era, and covers the time between 485.4 and 443.8 million years ago. It follows the Cambrian and is followed by the Silurian.
Etymology
The term "Ordovician" comes from the Celtic tribe of the Ordovices, which was recognized by the Roman Empire in the region of Wales. The name was suggested by Charles Lapworth in 1879 to resolve a dispute between followers of Adam Sedgwick and Roderick Murchison, who were arguing over the Cambrian and the Silurian systems.
Related Terms
- Cambrian: The geologic period that preceded the Ordovician.
- Silurian: The geologic period that followed the Ordovician.
- Paleozoic Era: The era of geologic time during which the Ordovician period occurred.
- Geologic Time Scale: A system of chronological dating that relates geological strata to time.
- Ordovices: The Celtic tribe from which the term "Ordovician" is derived.
External links
- Medical encyclopedia article on Ordovician
- Wikipedia's article - Ordovician
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