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EESA06H3 (563)
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Lecture 6


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Environmental Science
Nick Eyles

EESA06 LECTURE 6Step 1 A Very Short History of Life on Earth Various steps of evolution of life on earthFirst one The earliest Bacteria 38 GaAge of Earth 456The 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 formLife evolved around MORsBacteria could live in hot areas magmaHow are fossils formedFirst one in slide 26nice shell next one is a fossilized tree trunk petrified woodidea of having to dig through rockssedimentsThey are formed with the process of mineralizationFor example a snail that dies the soft parts are eaten by bacteria but you are left with the shellovertime sediments bury the shellit adds pressure on the snail shellthe sediments near to the bottom of the pile LITHIFY turn into rockthe little snail shell is affected by hot water that comes through the rock Water underground has stuff inside of it silica ironOvertime the minerals replace the shella nice model of what the creature shell It is difficult to keep a soft bodyPer mineralizationOne 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 mountainsHow can we see fossilsThose rocks were uplifted by tectonic forces Ammonite an organic gemstonefancy mineral name aragniteIts coloured by the chemical editions Iron AluminumAll minerals are usually colored Some fossils are like footprints in the sandsometimes they get preserved trace fossils show evidenceStudy of trace fossils ichnologyTrace fossils creatures doing stuff to the sediments changing the sediment burrowing inSedimentary geologist sometimes the creatures destroy the upper sediments so geologists have to be carefulSediments common in carbonate or limestone rocks in Ontario comes from the SEA LILY made of a long stemmop head they live in shallow waterstorms break up the bodies you usually find the broken up parts not the whole stemthe fossils tell us about the environmentsthey tell us what kind of creatures live therePale ecologists study of ancient organismsenvironmentsCrinoid fancy name for sea lilyFossil morphology the way your body looks hot climatetall cold climateshorterStratigraphy studying layers of rockFossils help us give us a relative age of rocks
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