period, periods, deposits, stage, cycles, stages, age, conditions, epoch, times, cycle, beds, changes, epochs, interval, intervals, phase, deposit, phases, transition, sediments, climate, ages, change, episodes, climates, levels, fluctuations, variations, level, transitions, fauna, episode, sites, soils, sequence, soil, ocean, sea, oscillations, date, flora, warmth, events, erosion, clays, contrasts, warming, peat, sequences, origin, maximum, era, faunas, complex, formation, terraces, gravels, stand, optimum, glacial, site, highstand, timescales, sands, strata, record, transgression, kieselguhr, forests, mode, succession, floras, records, temperatures, layers, regimes, scales, vegetation, horizons, forest, valleys, clay, variability, highstands, shifts, loess, weathering, bed

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