2 - Oldest Shelled Organisms = 535 Million years ago...

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03:14 1.6 km = 1 mile 0.6 mi = 1 km 7 mm = 1 m Power of 10 (Powers –how many zeroes) 10 0  = 1 10 = 10 10 2  = 100 10 3  = 1000 10 = 1,000,000 10 9  = 1,000,000,000 10 -1  =0.1 Earth/Solar System is about 4.6 Billion Years Old Universe  Big Bang occurred about 12 billion years ago Radiometric Dating   Radioactive Decay 1940s – 1950s of absolute time scale The radiometric date is based on ration of parent to stable daughter elements Radio active element decays (1/2 lifes) 40 K   40 Ar   ½ life = 1.19 x 10 10  years for K to turn into Ar 14 C   14 N  ½ life = 5,570 years for C to turn into N Ex: 230 U   208 PB
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Decay   into Lead SEE DIAGRAM 1 Oldest Rocks on Earth = 3.8 billions of years ago (Ga) Oldest Minerals on Earth = 4.2 Ga
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Unformatted text preview: Oldest Shelled Organisms = 535 Million years ago (Cambrian Explosion) Oldest Rocks on earth are always on CONTINENTS Oldest Rocks in oceans are only about 200 Million years old CA state rock = serpentile Meteorites = meteors that hit earth Date meteorites = 4.6 Ga “Carbonaceous Chondrite” Primitive Stony Meteorites (not metallic) Has never experiences temperatures greater than 200 degrees Celsius Have never been part of a planet or large asteroid Thought to give the best guide to the original abundances of the elements in the solar system Contain 20% water and volatile compounds which suggests that they have never undergone excessive heating 03:14 03:14...
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This note was uploaded on 10/06/2010 for the course GEOLOGY 240 taught by Professor Sammi during the Fall '09 term at USC.

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2 - Oldest Shelled Organisms = 535 Million years ago...

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