Earth_3

Earth_3 - supercontinent Rodinia weathering removes CO 2...

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Fossils Some evidence of pre-existing life of some age. 1. Whole organisms – frozen/mummified/pickled 2. Unaltered hard parts – shells, bones, teeth, hair 3. Permineralized hard parts -pertified 4. Molds and Casts 5. Impressions 6. Tracks, trails, traces 7. Chemical –  13 C/ 12 C
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Homework What is the most important advance life  has made since it appeared?
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Origin of the Eukaryotes First appear 2.2-2.7 BY, diversify 1.2 BY
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Endosymbiosis Theory Sex = Death ?
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Modern Examples Pelomyxa palustris Jeon, K.W. 1991. Amoeba and x-Bacteria:  Symbiont Acquisition and Possible Species  Change  
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from Jere Lipps
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Evolution of the Atmosphere red beds BIF’s
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Banded Iron Formations
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Glaciation 2.7-2.4 Bya 800-700 Mya –  Snowball Earth Possible causes:
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Unformatted text preview: supercontinent Rodinia weathering removes CO 2 greenhouse destroyed ice covers land and sea up to 1 km temp drops to -50 eventually volcanoes add CO 2 ice melts and temp. rises to 50 freeze and fry Effect on Life Ediacara Fauna first metazoans Cambrian Explosion Lots of things with hard parts -fossils why now? Burgess Shale Charles Walcott Chordates Fish Jaws Placoderms Latimeria Marjorie Courtney-Latimer, 1938 Ichthyostega Legs Acanthostega Reptiles Amniote egg Hylonomus Tetrapod Family Tree Eukaryotes Metazoans-Ediacara Chordates-Pikaia Vertebrates-fish Jaws Amphibians Reptiles Superbowl of Tetrapod Evolution Dinosaurs vs. Mammals Whos your favorite?...
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Earth_3 - supercontinent Rodinia weathering removes CO 2...

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