Silurian
Số nhiều: Silurians
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paleontologygeologystratigraphyperiodepocheracambrianordoviciandevoniancarboniferouspermiantriassicjurassiccretaceouspaleozoicmesozoiccenozoicfossilsedimentstratumrockshalelimestonesandstonebedrocktrilobitebrachiopodcrinoidgraptolitecephalopodgastropodbivalveostracodconodontplacodermagnathanfishvascular plantbryophytesporeevolutionextinctionbiodiversityoceansea levelcoastlinecontinentgondwanalaurentiatectonicsglaciationclimateatmosphereoxygencarbonmineraldepositionerosionchronologygeologic timeprehistoricancientprimordialbiotafaunaflora