period, rocks, age, time, strata, beds, times, deposits, formation, fossils, limestone, tertiary, sea, epoch, seas, sandstone, extinction, boundary, sequence, eocene, era, flora, rock, stratigraphy, forms, species, dinosaurs, events, mammals, fauna, shale, peneplain, paleocene, birds, sands, climate, event, surface, periods, cover, transgression, sequences, plants, sedimentation, series, units, succession, genera, paleogeography, basin, evolution, lower, record, ocean, unconformity, clay, ages, deposit, uplift, flysch, arc, genus, conglomerate, vegetation, subsidence, chalk, bedrock, oceans, deformation, flint, seaway, complex

late, early, upper, latest, lower, middle, mid, jurassic, marine, uppermost, pre, later, earliest, post, lowermost, entire, warm, thick, younger, triassic, equable, basal, dull, earlier, end, terminal, folded, lowest, transgressive, continental, horizontal, fossiliferous, medial, undoubted, disturbed, topmost, probable, invertebrate, tertiary, metamorphic, deformed, boreal, lying, water, dipping, alaska, eocene, texas, freshwater, mexico, peruvian, devonian, bearing, cambrian, brazilian, colombian, jura, unconformable, latitude, carboniferous, unconsolidated