GEOL 107 Study Guide - Final Guide: Great Oxygenation Event, Cambrian Explosion, Marinoan Glaciation
15 Aug 2016
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Eon: archean (4. 6-2. 5 ga), proterozoic (2. 5ga-540 ma), phanerozoic (540ma- present)angiosperms. Era: phanerozoic (3 eras: paleozoic (2. 5ga-250 ma): age of trilobites, brachiopods & other archaic invertebrates in the seas. First land plants, amphibians & reptiles occur late in this era: mesozoic (250-64 ma): age of dinosaurs. Ammonites, ichthyosaurs & plesiosaurs in the seas: cenozoic (64ma-present): acme of mammals, birds & flowering plants. Period: late proterozoic: ediacaran, paleozoic: cambrian, ordovician, silurian, devonian, carboniferous, Permian: mesozoic: triassic, jurassic, cretaceous, cenozoic: paleogene, neogene. Epochs: paleogene: paleocene, eocene, oligocene, neogene: miocene, pliocene, pleistocene radioisotopes: radioactive atoms that contain an unstable combination of neutrons and protons half-life: amount of time required for the amount of something to fall to half its initial value. 14c dating: dating using 14c >14n to date organic fossils <60 000 yo useful for archeologists of ! U/pb dating: uranium to lead found in zircons from volcanic ash highly precise for >60 000 yo.
