Silurian
's information is
Birth and death years unknown
The Silurian ( sih-LURE-ee-ən, sy-) is a geologic period and system spanning 23.5 million years from the end of the Ordovician Period, at 443.1 Ma (million years ago) to the beginning of the Devonian Period, 419.62 Ma. The Silurian is the third and shortest period of the Paleozoic Era, and the third of twelve periods of the Phanerozoic Eon. As with other geologic periods, the rock beds that define
* Calculated from Wikipedia data.
Accuracy is not guaranteed.
| Silurian | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
.png) A map of Earth as it appeared 430 million years ago during the Silurian Period, Wenlock Epoch | |||||||||||||
| Chronology | |||||||||||||
| |||||||||||||
| Etymology | |||||||||||||
| Name formality | Formal | ||||||||||||
| Synonym(s) | Gotlandian | ||||||||||||
| Usage information | |||||||||||||
| Celestial body | Earth | ||||||||||||
| Regional usage | Global (ICS) | ||||||||||||
| Time scale(s) used | ICS Time Scale | ||||||||||||
| Definition | |||||||||||||
| Chronological unit | Period | ||||||||||||
| Stratigraphic unit | System | ||||||||||||
| First proposed by | Roderick Murchison, 1835 | ||||||||||||
| Time span formality | Formal | ||||||||||||
| Lower boundary definition | FAD of the Graptolite Akidograptus ascensus | ||||||||||||
| Lower boundary GSSP | Dob's Linn, Moffat, United Kingdom 55°26′24″N 3°16′12″W / 55.4400°N 3.2700°W | ||||||||||||
| Lower GSSP ratified | 1984 | ||||||||||||
| Upper boundary definition | FAD of the Graptolite Monograptus uniformis | ||||||||||||
| Upper boundary GSSP | Klonk, Czech Republic 49°51′18″N 13°47′31″E / 49.8550°N 13.7920°E | ||||||||||||
| Upper GSSP ratified | 1972 | ||||||||||||
| Atmospheric and climatic data | |||||||||||||
| Sea level above present day | Around 180 m, with short-term negative excursions | ||||||||||||
Look up "Silurian" on WikipediaWikipedia Categories
Loading...