proterozoic - proterozoic PROTEROZOIC EONOTHEM C hapter 8...

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12/19/11 proterozoic 1/12 PROTEROZOIC EONOTHEM Chapter 8 Outline The Precambrian Fossil Record Evidence for Precambrian Life Morphological fossils -black chert Stromatolites Chemical fossils ±C12/C13 ratios Pristane and Phytane: stable geologically stable organic molecules Products of decomposition of chlorophyll Precambrian Microfossils 3.5 bya: Warrowoonda Group, western Australia 3.4 bya: Fig Tree Formation, Southern Africa 2.1 bya: Gunflint Chert, Canada 2.0 to 1.8 bya: Oldest Eukaryote 0.75 bya: Bitter Springs Formation, Central Australia Precambrian Macrofossils 1.25 bya: Metaphytes 0.6 bya: Ediacaran Fossils of Southern Australia Small shelly faunas (the Tomotian fauna) The Precambiran Record The biosphere The atmosphere The lithosphere Physical Features Banded Iron Formations Pyritic conglomerates Red Beds The Proterozoic Diversification Key Terms (see p.120 of text) The Snowball Earth Theory 1.- Paleontological Features Chronostratigraohic Divisions Time interval: 2500 m\a to 543 m\a RelativeTime Scale for the Protero]oic Main Fossil Types Microfossils of the Paleoprotero]oic ( 2,100-million-\ear-old) Gunflint chert of southern Canada . Filamentous microfossils of the Neoprotero]oic ( 850-million-\ear-old) Bitter Springs chert of central Australia Eo]oon canadense Stromatolites: What are stromatolies? Some e[amples of American Stromatolites Algae: What are algae? Acritarchs Ediacaran Fauna: Soft-bodied animals Charnia Eoporpita
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12/19/11 proterozoic 2/12 Nemiana PWeUidiniXm AUkaUXa DickinVonia SpUiggina TUibUachidiXm KimbeUella C\clomedXVa On the ta[onomic status of Ediacaran Fossils Skeletal fossils CloXdina: oldeVW knoZn VkeleWal foVVilV The naWXUe of Whe WeUminal PUoWeUo]oic foVVil UecoUd. 2.- Biological Features EYolXWionaU\ WUendV C\anobacWeUia flXUiVhed : SWUomaWoliWeV SWUomaWoliWeV in Whe h\peU-Valine ZaWeU of Hamelin Pool aW Whe baVe of ShaUk Ba\ in w.A. EXkaU\oWeV abXndanW: EaUl\ eXkaU\oWeV MajoU eYenWV leading fUom pUokaU\oWeV Wo mXlWicellXaU animalV Algae: HaYe a look aW Vome gUeen algae GU\pania a coiled mXWicellXaU algae 3.- Geological Features PaleogeogUaph\: Global eYenWV in Whe PUoWeUo]oic GlaciaWion in Whe PUoWeUo]oic 4.- Summar\ of Protero]oic Events Acritarchs (Late Precambrian - Quaternar\) are marine, hollow, organic-walled unicellular vesicles. Their biological affinities are unclear. The\ are placed together with other pal\nomorphs due to their resistant cell wall. Most of them are 0.02-0.150 mm across. The WeUm AcUiWaUchV ZaV coined b\ EYiWW in 1963, Wo UefeU Wo micUofoVVilV "of XnceUWain oUigin", Whe\ aUe an aUWificial gUoXp. The gUoXp inclXdeV an\ Vmall (moVW aUe beWZeen 20-150 micUonV acUoVV), oUganic-Zalled micUofoVVil Zhich cannoW be
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proterozoic - proterozoic PROTEROZOIC EONOTHEM C hapter 8...

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