BIOL 2400 Chapter Notes - Chapter 3: Devonian, Hominini, Notochord
5 Dec 2013
School
Department
Course
Professor
Document Summary
3. 1 the ancient earth: darwin rejected the theory that the earth was only a few 1000 yrs old. Believed it was billions: darwin formerly a geologist, through the study of rock formation darwin concluded the earth had to be billions of years old, darwin"s critic kelvin, argued that the earth wasn"t as old as they thought. His argument was based on the temperature of rocks: the earth began as a ball of molten rock, it cooled and hardened; the heat from the core escaped into space. Rocks cool at a steady rate so you can calculate the age of rocks underground and therefor the age of the planet. Mainly formed in anoxic, lifeless pools, lagoons or bays: burgess shale: a lagerst tten in canada that preserved fossils from the. 3. 3 life"s earliest marks: stromatolites: layered structures formed by the mineralization of bacteria. Grow on the floors of lakes and shallow seas.
