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The Silurian (/ s ɪ ˈ lj ʊər i. ən, s aɪ-/ sih-LURE-ee-ən, sy-) [8] [9] [10] is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at 443.1 million years ago (), to the beginning of the Devonian Period, 419.62 Mya. [11]
The Silurian hypothesis is a thought experiment, [1] which assesses modern science's ability to detect evidence of a prior advanced civilization, perhaps several million years ago. The most probable clues for such a civilization could be carbon , radioactive elements or temperature variation.
Vanity Fair print of Sir Roderick Murchison Roderick Impey Murchison posing with cane. Sir Roderick Impey Murchison, 1st Baronet (19 February 1792 – 22 October 1871 [1]) was a Scottish geologist who served as director-general of the British Geological Survey from 1855 until his death in 1871.
The Salina Group or Salina Formation is a Late Silurian-age, Stratigraphic unit of sedimentary rock that is found in Northeastern and Midwestern North America.Named for its Halite beds, the phrase "Salina Group" was first used as a descriptive term by James D. Dana in 1863.
In the geological timescale, the Ludlow Epoch (from 427.4 ± 0.5 million years ago to 423.0 ± 2.3 million years ago) occurred during the Silurian Period, after the end of the Homerian Age. It is named for the town of Ludlow in Shropshire, England. The Ludlow Epoch is subdivided into two stages: Gorstian and Ludfordian.
Silurian geology of North America (1 C, 1 P) Silurian System (7 C, 1 P) W. Wenlock geology (1 C) Pages in category "Silurian geology" The following 5 pages are in ...
The geology of Estonia is the study of rocks, ... During the Ordovician and Silurian, ... Estonian geologists have developed The Book of Primeval Nature, chronicling ...
The geology of Wales is complex and varied; its study has been of considerable historical significance in the development of geology as a science. All geological periods from the Cryogenian (late Precambrian ) to the Jurassic are represented at outcrop, whilst younger sedimentary rocks occur beneath the seas immediately off the Welsh coast.