Devonian definition

  • adjective:
    • Of or from the geologic time, system of stones, or sedimentary deposits regarding the 4th amount of the Paleozoic Era, characterized by the introduction of lobe-finned fishes, the appearance of amphibians and bugs, as well as the first forests. See Table at geologic time.
    • of a geologic period inside the Paleozoic period; comprises lower, middle and upper epochs from about 415 to 360 million years back
    • Of or pertaining to the English area of Devon.
    • Of or pertaining to Devon or Devonshire in The united kingdomt.
  • noun:
    • The Devonian stage or its system of build up.
    • A native or inhabitant of English area of Devon.
    • The Devonian age or formation.
    • A native or inhabitant of Devonshire.
    • In geology, the Devonian show.
    • from 405 million to 345 million years back; preponderance of fishes and appearance of amphibians and ammonites
  • proper-noun:
    • the Devonian duration
  • others:
    • Of or regarding Devonshire in England.
    • the word had been used specifically, in geology, by Murchison to a great part of the Paleozoic strata of North and South Devon, and utilized by him as synonymous with Old Red Sandstone, for which term he substituted it, “because the strata of that age in Devonshire—lithologically very unlike the old red sandstone of Scotland, Hereford, and South Welsh counties—contain a more copious and wealthy fossil fauna, and had been proven to take the same advanced place between your Silurian and Carboniferous rocks.” Later geologists, but don't use the terms as identical, the circumstances under that your strata had been deposited being different.
    • This term was first applied in geology by Sedgwick and Murchison to a series of rocks in North and Southern Devon and Cornwall which fossils had been discovered that have been recognized by Lonsdale as advanced in character between Silurian and Carboniferous. The low and upper limitations associated with formation weren't defined in Britain, but had been even more specifically based on similar geologists into the Rhineland. Therefore unsure, however, had been the bounds assigned towards the base of the development more recent study in various nations features added to the reduced element of this method substantial beds which had prior to been assigned toward Silurian system. Strictly applied, the definition of Devonian implies the stones bearing the marine faunas of that some time is contrasted utilizing the Old Red Sandstone, that will be a formation occasionally different lithologically and which signifies the pond, lagoon, or delta deposits of the same age.

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