rocks, period, age, time, times, strata, formations, boundary, fauna, fossils, era, trilobites, sediments, formation, granite, rock, sandstones, schists, basement, deposits, geology, explosion, shield, limestones, beds, complex, granites, ordovician, peneplain, transition, shales, areas, surface, series, slates, limestone, gneiss, quartzites, gneisses, sandstone, stratigraphy, history, silurian, area, quartzite, seas, faunas, movements, schist, conglomerates, animals, glaciation, record, periods, brachiopods, conglomerate, sequence, organisms, lower, sections, trilobite, origin, ages, terranes, interval, igneous, shields, crystallines, ores, eras, unconformity, sea, outcrops, floor, succession, dolomites, algae, hills, mountains, peneplane, arthropods, core, onwards, deposit, slate, belts, batholiths, intrusions, paleogeography

pre, late, early, lower, upper, middle, earliest, precambrian, post, latest, fossiliferous, mid, later, basal, uppermost, lowermost, infra, lowest, prc, neoproterozoic, vendian, proterozoic, oldest, siluro, sub, thick, pro, folded, sinian, honest, bearing, marine, probable, undifferentiated, undoubted, jellyfish, autochthonous, unaltered, fiery, bedded, ediacarian, siliceous, medial, resistant, youngest, subjacent