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Early Earth

Early Earth. Emily Calder Madeline Cudmore Rebecca Shatney. Lacking Evidence…. Hadean Era. 10 billion years after formation of the universe. Earth forms from gas and dust. Meteors 500 million years uninhabitable. Hot. Mass increase temp decrease.

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Early Earth

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  1. Early Earth Emily Calder Madeline Cudmore Rebecca Shatney

  2. Lacking Evidence…

  3. Hadean Era • 10 billion years after formation of the universe. • Earth forms from gas and dust. • Meteors 500 million years uninhabitable. • Hot. • Mass increase temp decrease. • Early atmosphere-CO2, water vapor, nitrogen, methane, ammonia. • Little or no oxygen. • UV rays. • Meteor collisions decrease temp decrease. • Surface hardens. • Water vapor -> rain ->oceans.

  4. Beginning of life • 3.85 million years ago. • Greenland. • Need organic chemicals. • RNA. • Underwater geothermal vents.

  5. Chronometric Defining • According to events. • Natural disasters, discoveries, dating, life… • Even period divisions. • Random durations. • Neoproterozoic • Ediacaran-630 • Cryogenian-850 • Tonian-1000 • Mesoproterozoic • Stenian-1200 • Ectasian-1400 • Calymmian-1600 • *Million Years Ago

  6. Mesoarchean • 3.2- 2.8 billion years ago. • Defined chronometrically. • One of the first supercontinent Vaalbara broke during this time. • Life forms have not changed much.

  7. Neorarchean • 2.8 – 2.5 billion years ago. • Also defined chronometrically. • Oxygen photosynthesis first evolved (caused the oxyen catastrophe, which was in the paleoproterzoic era). • The supercontinent Kenorland was formed around 2.7 billion years ago. • Life forms have not changed much.

  8. Paleoprotoerzoic Era • Statherian, Orosirian, Rhyacian, Siderian. • 2.5 to 1.6 billion years ago. • Continents first stabilized. • Ur • Arctica • Atlantica • Nena • Columbia • Anaerobic life. • Life using oxygen and photosynthesis appeared. • Oxygen Catastrophe. • Fossil evidence of the first eukaryotes. • Paleontological evidence-1.8 billion years ago- 450 days a year and 20 hours a day.

  9. Mesoproterozoic Era • Stenian, Ectasian, Calymmian. • 1.6 to 1.0 billion year ago. • Supercontinent Rodinia. • Great floodplain. • Sexually reproducing life appears. • Multi-cellular animals. • Oxygen levels rise significantly. • No big natural disasters or events. • Continent pieces expand, causing the ocean to shallow.

  10. Neoproterozoic Era • Ediacaran, Cryogenian, Tonian. • 1.0 billion to 542 million years ago. • Rapid melting of all ice caps on the world. • Breakup of Rodinia. • Formation of Pannotia. • Rise in carbon dioxide leads to mini ice age. “Snow Ball Earth”. • Rise of soft-bodied multicellular organisms. • Diseases appear. • Corals, sea anemones, hydras, jellyfish, simple metazoa. • Not organs • Just a body cavity or stomach • Mouth, usually surrounded by tentacles.

  11. http://www.youtube.com/watch?v=hSdlQ8x7cukhttp://www.youtube.com/watch?v=hSdlQ8x7cukhttp://www.youtube.com/watch?v=hSdlQ8x7cukhttp://www.youtube.com/watch?v=hSdlQ8x7cuk

  12. Citations • http://www.mahjoob.com/en/forums/showthread.php?t=275459 • http://lena-panthera.deviantart.com/art/Carte-de-Vaalbara-map-173079888 • http://www.geol.umd.edu/~tholtz/G102/102arch2.htm • http://en.wikipedia.org/wiki/Neoarchean • http://en.wikipedia.org/wiki/Mesoarchean • http://bio1152.nicerweb.com/Locked/media/ch25/clock.html • http://astroclock2010.files.wordpress.com/2010/05/hadean_earth_space_art.jpg • http://www.sciencephoto.com/image/134450/530wm/C0071453-Formation_of_the_Earth,_artwork-SPL.jpg • http://www.fossilmuseum.net/Paleobiology/Images/cyanobacteria.jpg • http://science.nationalgeographic.com/science/prehistoric-world/precambrian • http://en.wikipedia.org/wiki/Paleoproterozoic • http://essayweb.net/geology/timeline/paleoproterozoic.shtml • http://palaeos.com/proterozoic/proterozoic.htm • http://essayweb.net/geology/timeline/mesoproterozoic.shtml • http://www.pbs.org/wgbh/evolution/change/deeptime/precam.html

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