palaeozoic, ordovician, devonian, miocene, proterozoic, triassic, paleozoic, paleocene, eocene, oligocene, campanian, cretaceous, zechstein, palaeocene, pliocene, archaean, turonian, precambrian, paleogene, dolomites, graben, mesolithic, carboniferous, limestones, neocomian, neogene, mesozoic, evaporite, archean, sarmatian, tertiary period, schists, stratigraphy, silicic, claystone, upper carboniferous, depositional, upper paleolithic, homo heidelbergensis, lamprophyre, lower carboniferous, relict, sandstone, embayment, cenozoic, argillite, middle paleolithic, gabbro, craton, clastic, orogenic, pelitic, 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, hadean, siderite, overthrust, eocene epoch, carboniferous period, amphibolite, noachian, phyllosilicate, syrtis major, geochronology, pitchblende, eluvial, pleistocene, cambrian, permian, jurassic, tertiary, strata, pennsylvanian, sedimentary, ages, neolithic, mississippian, liassic, fossiliferous, arenaceous, oolitic

anaspid, heterostracan

paleozoic era

geological period, period

silurian period