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Definitions of Silurian:
  • noun:   from 425 million to 405 million years ago; first air-breathing animals



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Alternative Terms
palaeozoic sedimentary-rock igneous metamorphic-rock silurian-period graptolite geologic-timescale-table lithofacies-geology organism continents-evolution-of paleogeography zonal prevailing-westerly monsoon laurentia paleoceanography glaciation-3 coarse siliclastic paleoclimatology nearshore annelid arthropod paleobotany paleoecology alga cyanobacteria sponge stratum clam bryozoa crinoidea-2 ostracoda-2 trilobita boney spiny anaspida heterostraci osteichthyes period silurian-silurian-period ordovician annum-2 devonian geology rock extinction-event reef gotland sweden roderick-murchison wales 1830s-2 celts-4 silures adam-sedgwick cambrian 1835 charles-lapworth joachim-barrande bohemia edward-forbes llandovery-epoch wenlock-epoch ludlow-epoch pridoli faunal-stage index-fossil ludlow-group ludfordian gorstian homerian sheinwoodian telychian aeronian rhuddanian ontario alexandrian gondwana glacier unconformity craton continental-drift equator supercontinent euramerica caledonian-orogeny evaporite teays-river panthalassa proto-tethys-ocean paleo-tethys-ocean rheic-ocean iapetus-ocean avalonia ural-ocean earth-disambiguation greenhouse south-pole coquina