Geologic timescale and natural history of the earth
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Geologic timescale and natural history of the earth

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I had created this presentation for myself about the Geologic timescale and Natural History of the Earth in terms of Galactic Years

I had created this presentation for myself about the Geologic timescale and Natural History of the Earth in terms of Galactic Years

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    Geologic timescale and natural history of the earth Geologic timescale and natural history of the earth Presentation Transcript

    • Geologic Timescale andNatural History of the Earth Jahid Masud Akon
    • Units in geochronology and stratigraphy Units in geochronology and stratigraphy Segments of rock (strata) Periods of in time in chronostratig geochron raphy ology Notes Eonothem Eon 4 total, half a billion years or more Erathem Era 12 total, several hundred million years System Period Series Epoch tens of millions of years Stage Age millions of years smaller than an age/stage, not used by the ICS Chronozone Chron timescalePage  2
    • Eons Precambrian Supereon Present time 18.28 GY 15.2 10 2.2 =4570 Ma Hadean Archean Proterozoic Phane 770 Ma 1300 Ma 1958 Ma rozoic Formation of the Earth and later, Moon (Cryptic Era) 542 Ma First lifeform and self replicating RNA appears (16 GY, Basin Groups Era) First simple single-celled life (Prokaryote, Eoarchean Era) First complex single-celled life (Eukaryote, Statherian Period) First multi-cellular animal (Metazoan, Ediacaran Period) 1 GY = 250 Ma Cambrian Explosion (Cambrian Period) (GY = Galactic Year, the time the Solar System takes to go round the centre of the Galaxy once; Ma = Millions of years (ago), Megaanum)Page  3
    • Hadean & Archean Eon to Eras 18.28 GY 15.2 10 2.2 Phanerozoic Hadean Archean Proterozoic 50 Ma First known oxygen-producing bacteria; Oldest cratons on earth Formation of Moon from Lower giant impact (4533Ma) 70 Ma Imbrian Nectarian Proterozoic Eon 230 Ma 200 Ma 400 Ma 400 Ma 300 Ma 420 Ma Basin Eoarchean Paleo Meso Neo Cryptic Groups archean archean archean Solar Nebula 15.4 16.6 15.68 15.2 14.4 12.8 11.2 10 Paleoproterozoic 18.28 GY Era =4570 Ma First lifeform and self-replicating First simple single-celled life (bacteria RNA appears & archaea); Oldest probable microfossils (4000Ma) Formation First stromatolites (probably colonial End of the Late Heavy Bombardment of of the Earth cyanobacteria); Oldest macrofossils the inner solar system. Oldest known mineral, ZirconPage  4 (4406 Ma)
    • Proterozoic Eon to Eras & Periods 18.28 GY 15.2 10 2.2 Phanerozoic Hadean Archean Proterozoic Archean Phanerozoic Eon 250 Ma Rhyacian 200 Ma Statherian 200 Ma 150 Ma 88 Ma Eon Ectasian Tonian Ediacaran 200 Ma 250 Ma 200 Ma 200 Ma 220 Ma Siderian Orosirian Calymmian Stenian Cryogenian 9.2 8.2 7.2 5.6 4.8 3.4 2.52Neoarchean 4 Cambrian 2.2 Era 10 GY Paleoproterozoic 6.4 Mesoproterozoic Neoproterozoic Period 900 Ma 600 Ma 458 Ma Snowball EarthPeriod First complex single-celled life Green algae colonies in seaEra (Eukrayote) First multi-cellular animal (Metazoan); First sponges, trilobitomorphsPage  5
    • Phanerozoic Eon to Eras 18.28 GY 15.2 10 2.2 Hadean Archean Proterozoic Phanero zoic Precambrian Supereon & Proterozoic Eon Ediacaran Period 2.2 Paleozoic 1 Mesozoic 0.26 Cenozoic 291 Ma 186 Ma 65 Ma (= 65 Ma)Page  6
    • Paleozoic Era to Periods Proterozoic Eon 2.2 GY Paleozoic 1 Mesozoic 0.26 Cenozoic (= 65 Ma) First clubmosses, ferns, seed-bearing plants, trees, Cambrian Explosion; insects, aquatic amphibians Precambrian First chordates appear; Atmospheric CO2 content Supereon & 20-35 times present day levels First reptiles, coal forests; Proterozoic Highest-ever atmospheric O2 level Mesozoic Eon letting arthropods to flourish Era 54 Ma 44 Ma 28 Ma 56 Ma 60 Ma 49 Ma Cambrian Ordovician Silurian Devonian Carboniferous PermianEdiacaran Period Triassic 542 Ma 444 416 251 Period 488 360 300 (= 2.2 GY) (= 1 GY) First green plants Pangea formed; First true seed-plants & fungi on land (conifers) & mosses replace coal-age flora First vascular plants, jawed fishes; First millipedes & arthropleurids on land; Permian-Triassic Mass Extinction Sea-scorpions reach large size (95% life goes extinct)Page  7
    • Mesozoic Era to PeriodsProterozoic Eon 2.2 GY Paleozoic 1 Mesozoic 0.26 Cenozoic (= 65 Ma) First birds & lizards; ichthyosaurs, plesiosaurs, gymnosperms (conifers, cycads) diverse; K-T Mass Extinction Breakup of Pangaea into Gondwana and Laurasia Most large animals (dinosaurs) go extinct Paleozoic Era Cenozoic Era 51 Ma 55 Ma 80 Ma Triassic Jurassic Cretaceous Permian Period Paleogene 251 Ma 200 145 Period (= 1 GY) 65 (= 0.26 GY) Archosaurs dominate as dinosaurs, Flowering plants, new insect types, ichthyosaurs, nothosaurs & pterosaurs; new dinosaur types, new eusuchians, modern sharks, First mammals, crocodilians, teleosts appears monotremes, marsupials, placental mammals appear; Primitive birds gradually replace pterosaursPage  8
    • Cenozoic Era to Periods and EpochsProterozoic Eon 2.2 GY Paleozoic 1 Mesozoic 0.26 Cenozoic (= 65 Ma) First large mammals, Ice Age recedes; modern plants appear; Rise of human civilization Evolution of anatomically modern humans; Indian subcontinent collides with Asia 55Ma Dawn of human stone-age cultures Mesozoic 2.489 Ma Era Grass appears; atmospheric Pleistocene 2.8 Ma CO2 decays Pliocene Holocene 9.2 Ma 21.8 Ma 11 Ma 17.7 Ma 0.0114 Ma Paleocene Eocene Oligocene Miocene Permian Period 65 Ma (= 0.26 GY) 55.8 34 2.5 5.3 0.0114 42 Ma 23 23 Ma (=11.4 ka) Paleogene NeogeneEpochPeriod First apes appear Major evolution & dispersal of modern types of Austrapithecines appear;Page  9 mammals & flowering plants Homo habilis appears; Present Ice Age begins;
    • The EndPage  10