<p> Geologic Time</p><p>The table below is a compilation the history of the Earth, based on a large number of dated fossil finds and rock formations. Periods of time in the Earth's history are traditionally divided into eons, eras, periods, and epochs, each of which occupies a particular absolute time range, in millions of years ago (MYA) based on radiometric dating, and during which particular types of fossils are found. </p><p>Remembering that the vertical axis of your hypothesis diagram represents a time scale, you should compare the sequence of appearance of various groups here with what is shown in your hypothesis. </p><p>Beginning, Eon Era Period Epoch MYA before Events in fossil record present P End of last ice age Holocene 0.011 H Quaternary (civilization, history) A Pleistocene 1.8first humans N E Pliocene 5.3first apes R Diversification of horses, deer, Miocene 23.8 O etc. Cenozoic Z first monkeys, various groups of Oligocene 33.7 O mammals I Tertiary C Eocene 54.8Early whales, ungulate ancestors</p><p> extinction of dinosaurs, lots of Paleocene 65 new mammals first flowering plants, oldest Cretaceous 144 mushroom fossils Jurassic 206first birds Mesozoic first conifers, dinosaurs, and Triassic 248 mammals </p><p>Paleozoic mammal-like reptiles, first Permian 290basidiomycete fungi (phylum including mushrooms) Pennsylvanian 325first reptiles Carboniferous Mississippian 354first amphibians, insects</p><p>Devonian 417First land vertebrates, first ferns First land plants and land Silurian 443invertebrates, first fish with jaws, first land fungi. Ordovician 490first vertebrates (fish). </p><p>Lots of new invertebrate phyla -- Cambrian 543 mollusks, trilobites, etc. </p><p>P Upper 900first multicellular organisms R Middle 1600first eukaryotes E Proterozoic C Lower 2500first bacterial plankton A M Archean 3800first bacteria B R oldest Solar System rocks -- no I Hadean 4500 A fossils N</p><p>Adapted from Strickberger, Evolution, with additional information from (and links to) University of California Museum of Paleontology.</p>
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