geologictime1 - GeologicTime A major difference between...

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Geologic Time A major difference between geology and other sciences is time. A "long" time may not be important unless it is > 1 million years in geology.
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The Geologic Time Scale The Geologic Time Scale
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Composite column divided into time blocks. Eons – Largest subdivision of time. Eras – Subdivisions of eon. Periods – Subdivisions of era. Epochs – Subdivisions of period. Geologic Time Scale Geologic Time Scale
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Eons Phanerozoic – “Visible life” (542 Ma - present) Marks 1st appearance of hard shells. Life diversified rapidly afterward. Proterozoic – “Before life” (2.5 - 0.542 Ga) Development of tectonic plates like those of today. Buildup of atmospheric O 2 ; multicellular life appears. Archean – “Ancient” (3.8 - 2.5 Ga). Birth of continents. Appearance of earliest life forms. Hadean – “Hell” (4.6 - 3.8 Ga) Internal differentiation. Formation of oceans and secondary atmosphere. Geologic Time Scale Geologic Time Scale P r e c a m b i n
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Geologic Time Scale Geologic Time Scale Phanerozoic Eras Cenozoic – “Recent life.” 65 Ma to present. “Age of Mammals.” Mesozoic – “Middle life.” 245 to 65.5 Ma. “Age of Dinosaurs.” Paleozoic – “Ancient life.” 542 to 245 Ma. Life diversified rapidly.
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Earth’s Oldest Fossils Apex Chert, Australia - 3.5 Gyr
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Cyanobacteria Formed Colonies: Cyanobacteria Formed Colonies: Stromatolites Stromatolites
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Stromatolites Stromatolites Layered structures formed by trapping sediment grains by biofilms of microorganisms. Added oxygen to the atmosphere through photosynthesis.
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Stromatolite - 3.5 Gyrs Stromatolite - 3.5 Gyrs North Pole, Australia North Pole, Australia
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Ediacara Hills, Australia Dickinsonia Marine fossils Marine fossils late Precambrian late Precambrian 620 - 543 Ma 620 - 543 Ma Oldest known Oldest known multicellular multicellular fossils fossils
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Late Precambrian Trace Fossils
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Skeletons and Shells Small Shelly Fossils: common and diverse in basal Cambrian.
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Burgess Shale Important mid-Cambrian fossil deposit. 505 Ma Black shale in Canadian Rockies Discovered by Charles Wolcott - 1909
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Reconstruction of Burgess Shale mid-Cambrian fauna
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Geologic time scale Geologic time scale Cenozoic Era: 0-65 Ma Recent life -Age of Mammals Mesozoic Era: 65-245 Ma Middle life - Age of Reptiles Paleozoic Era: 545-245 Ma Ancient life Cambrian: obvious fossils Precambrian: no obvious fossils 87% of Earth History
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Permian-Triassic Extinction The Great Dying – 251 Ma.
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This note was uploaded on 12/01/2011 for the course SCIENCE 460:100 taught by Professor Staff during the Fall '10 term at Rutgers.

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geologictime1 - GeologicTime A major difference between...

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