ordovician, precambrian, paleozoic, palaeozoic, archaean, eocene, archean, schists, mesozoic, syenite, limestones, hornblende, batholith, alkalic, silurian, dolomites, triassic, basalts, paleocene, greywacke, orogenic, devonian, amphibolite, pliocene, graben, huronian, stratigraphy, gneiss, diabase, gabbro, miocene, granites, silicic, cenozoic, pluton, porphyry, neogene, diorite, argillite, stratiform, unconformity, argillaceous, dacite, sedimentary, pyroxenite, siltstone, clastic, igneous, monzonite, extrusive, oligocene, hornfels, muscovite, haematite, pelitic, depositional, granodiorite, paleogene, pegmatite, cretaceous, ankerite, anorthosite, breccia, dunite, metamorphism, craton, phyllite, stockwork, andesite, rhyolite, campanian, sulphides, syncline, ultrabasic, lithology, actinolite, pyrrhotite, terrane, biotite, kaolinite, pyrophyllite, lower carboniferous, norite, evaporite, footwall, argentiferous, anomalism, detrital, sericite, lavas, siderite, palaeocene, alunite, diamondiferous, mineralizing, hydrothermal, pentlandite, peridotite, greisen, pleistocene, zechstein, autunite, cambrian, jurassic, permian, tertiary, carboniferous, palaeolithic, pennsylvanian, neoproterozoic, phanerozoic, variscan, hercynian, holocene

precambrian period

era

early, preoterozoic era