Geologic time scale

Card 1 (Front): Hadean,Archaean,Proterozoic Eons Card 1 (Back): Precambrian

Card 2 (Front): Hadean Eon Card 2 (Back): Earth's surface was liquid rock and boiling sulfur.

Card 3 (Front): Archean Eon Card 3 (Back): Series of volcanic eruptions. Long chains of small islands.

Card 4 (Front): Proterozoic Eon Card 4 (Back): First evidence of oxygen build-up. Eukaryotic forms (multicellular algae) rise. (Note: Ediacarans/Dickinsonia appear in the fossil record and resemble a ribbed doormat.)

Card 5 (Front): + Mesozoic , Cenozoic Eras Card 5 (Back): Paleozoic

Card 6 (Front): Paleozoic Era - Key Event Card 6 (Back): Formation of Pangea. Explosion of different life forms.

Card 7 (Front): Cambrian Period Card 7 (Back): "Explosion of life." Trilobites appear.

Card 8 (Front): Ordovician Period Card 8 (Back): Dominated by marine invertebrates.

Card 9 (Front): Silurian Period Card 9 (Back): First land plants appear.

Card 10 (Front): Devonian Period Card 10 (Back): "Age of Fishes."

Card 11 (Front): Carboniferous Period Card 11 (Back): Seed plants and reptiles appear.

Card 12 (Front): Permian Period Card 12 (Back): Mass extinction event; 90% of Earth species vanish.

Card 14 (Front): Mesozoic Era - Nickname Card 14 (Back): "Age of Dinosaurs." Land masses remain together until later eras. Warm/humid environment.

Card 15 (Front): Triassic Period Card 15 (Back): Dinosaurs evolve alongside reptiles and mammals.

Card 16 (Front): Jurassic Period Card 16 (Back): Tectonic shifts occur. Dinosaurs dominate and reach giant sizes.

Card 17 (Front): Cretaceous Period Card 17 (Back): Rise of angiosperms (flowering plants).

Card 19 (Front): Cenozoic Era - Nickname Card 19 (Back): "Age of Mammals." Land masses move to their current positions; climate varies from warm to cold.

Card 20 (Front): Paleogene Period Card 20 (Back): Extinction of non-avian dinosaurs.

Card 21 (Front): Neogene Period Card 21 (Back): Rise of diverse large and small mammals.

Card 22 (Front): Miocene Epoch Card 22 (Back): Distinct flora and fauna develop.

Card 23 (Front): Pliocene Epoch Card 23 (Back): (Leave blank - no specific key event mentioned.)

Card 24 (Front): Quaternary Period Card 24 (Back): Evolution of the human genus.