Can you name the Periods of Earth's History? created by gracie Enter a period in the box below Correctly named periods will show up below Click any empty Time Period or Period to answer for that location Source: PBS This quiz has not been verified by Sporcle

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Time Period Period Major Developments 443-417 mya Vascular land plants, terrestrial arthropods 2500-543 mya Soft-bodied animals, oxygen levels reach 3%, breakup of Laurentia supercontinent 290-248 mya Formation of Pangaea, conifers, mammal-like reptiles 354-290 mya Swamps, tree ferns, first reptiles 4550-3800 mya Oldest known rocks, oceans form, evidence of life 65-54 mya First primates, rodents, and bats 206-144 mya Breakup of Pangaea, first birds 543-490 mya 'Explosion' of life, first chordates, first arthropods, Gondwana supercontinent forms 248-206 mya First mammals, crocodiles, and dinosaurs 1.8-0.01 mya Early cave-dwelling humans, periods of glaciation

Time Period Period Major Developments 5.3-1.8 mya First hominids, first global ice ages 24-5.3 mya Great mountain building, horses, kelp forests, chimpanzees 54-33 mya First whales, continents near present-day positions 417-354 mya First amphibians and seed plants, oxygen reaches present-day levels 144-65 mya First flowering plants and pollinating insects 3800-2500 mya Photosynthetizing bacteria, first eukaryotes, continents begin shifting 490-443 mya Appearance of land plants, sharks, and fishes 33-24 mya First apes, formation of grasslands 0.01-0 mya Present day

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