EESA06H3 Lecture Notes - Lecture 6: Cambrian Explosion, Paleozoic

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22 Apr 2012
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Step 1: a very short history of life on earth: Various steps of evolution of life on earth. First one: the earliest bacteria: 3. 8 ga. The earliest bacteria was not here at the beginning of earth ^ why not?? earth had lots of magma when it was formed so bacteria took a while to form. Bacteria could live in hot areas- magma. First one in slide 26 : nice shell, next one is a fossilized tree trunk: petrified wood, & idea of having to dig through rocks & sediments. They are formed with the process of mineralization. Water underground has stuff inside of it: silica, iron. Overtime the minerals replace the shell a nice model of what the creature shell. One of the first philosophers talked about the age of the earth was actually looking at fossils of creatures that were living in water but their bodies were on top of the great mountains.

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