silurian Definition

silurian period, devonian, ordovician, paleozoic, triassic, paleocene, miocene, cretaceous, proterozoic, eocene, carboniferous, oligocene, pliocene, precambrian, paleogene, campanian, mesozoic, neogene, archaean, cenozoic, turonian, archean, mesolithic, pleistocene, stratigraphy, depositional, sandstone, clastic, hadean, palaeozoic, zechstein, palaeocene, dolomites, graben, limestones, neocomian, evaporite, sarmatian, tertiary period, schists, claystone, rhynchonella, upper carboniferous, upper paleolithic, homo heidelbergensis, lamprophyre, lower carboniferous, relict, embayment, argillite, middle paleolithic, gabbro, craton, orogenic, metamorphism, lineaments, siltstone, aurignacian, hornfels, alkalic, ironstone, dolerite, diamondiferous, pyroxenite, lithology, ichthyosaur, shales, ammonite, ostracod, jurassic period, batholith, pelite, iguanodon, diabase, brachiopods, huronian, basalts, argillaceous, gneiss, granites, hornblende, devonian period, gossan, halite, adits, syncline, snailfish, muscovite, diorite, stromatolite, anticline, siderite, overthrust, eocene epoch, carboniferous period, amphibolite, noachian, phyllosilicate, syrtis major, geochronology,