BIOL 1F90 Chapter Notes - Chapter 22: Igneous Rock, Sedimentary Rock, Big Bang
16 Mar 2018
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Bio - life or relating to living organisms. 13. 7 bya: universe began with the big bang. 4 bya: earth had cooled enough for outer layers to solidify and oceans to form. B/w 4 and 3. 5 bya: life emerged. Life started off simple and became more complex, however we still have simple forms today, we just added more complex forms to the simple forms. Preserved remains of past life on earth. Organisms buried quickly, hard parts replaced by minerals. Older rock is deeper and older organisms are deeper in the rock bed. Sedimentary rock is the main type of rock that contains fossils. Fossils can be dated using elemental isotopes in accompanying rock. Half-life: length of time required for exactly one-half of original isotope to decay. Measure amount of a given isotope as well as the amount of the decay product. Expect fossil record to underestimate actual date specimen came into existence.
