Devonian
Devonian
Devonian (/dɪˈvoʊ.ni.ən/) is a geologic period and system of the Paleozoic, spanning 60 million years from the end of the Silurian, 419.2 million years ago (Mya), to the beginning of the Carboniferous, 358.9 Mya.
Etymology
The term Devonian comes from the county of Devon in England, where a controversial argument in the 1830s over the age and structure of the rocks found distributed throughout the county was eventually resolved by the definition of the Devonian period in the geological timescale.
Related Terms
- Geologic period: A subdivision of geologic time that divides an era into smaller parts. A geologic period is the most commonly used unit in geology to represent significant changes in the Earth's state.
- Paleozoic: The earliest of three geologic eras of the Phanerozoic Eon, from 541 to 252.17 million years ago. It is the longest of the Phanerozoic eras, lasting from 541 to 252.17 million years ago.
- Silurian: 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.
- Carboniferous: A geologic period and system that spans 60 million years from the end of the Devonian Period 358.9 million years ago, to the beginning of the Permian Period, 298.9 Mya.
External links
- Medical encyclopedia article on Devonian
- Wikipedia's article - Devonian
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