BIOL1510+F10+04+Earth+History

BIOL1510+F10+04+Earth+History - Georgia Tech School of...

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Biology 1510/1511 Georgia Tech School of Biology Fall 2010 BIOL 151X 04 Earth History 30 August 2010 Dr. Chrissy Spencer
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“Tree of Life” All organisms we know of on Earth today are descended from a common ancestor that lived about 4 billion years ago. Fig. 26.21
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Biology 1510/1511 Georgia Tech School of Biology Fall 2010 Geological Time Scale Campbell & Reece, Fig. 25.07 & Tbl. 25.1
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Biology 1510/1511 Georgia Tech School of Biology Fall 2010 Stratigraphy • Newer sedimentary rocks form on top of older rocks. Over time, sedimentary rocks can be buried, folded, overturned, and uplifted. Images: http://www.agiweb.org Devonian folded sequence, Alberta CA. © Marli Miller. http://www.agiweb.org Devonian Syncline/Anticline, Wales UK. © Marli Miller. http://www.agiweb.org Recumbent folds in limestone, Switzerland. © Marli Miller. http://www.agiweb.org Folded ribbon chert, Oregon. © Marli Miller. http://www.agiweb.org
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Biology 1510/1511 Georgia Tech School of Biology Fall 2010 Radioactive parent isotopes and their stable daughter products
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Georgia Tech School of Biology Fall 2010 Radioactive Decay and Dating Decay of a radioisotope N = N o e - λ t λ = decay constant N = # atoms present Half life = t : time required for half the atoms initially present to decay. See this
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BIOL1510+F10+04+Earth+History - Georgia Tech School of...

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