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Unformatted text preview: Lecture 4 History of Life 6-15-09 The Geological Record History of life on earth key events, dominant groups, drift evo-devo (Evolutionary Developemental Biology) Evolutionary Trends Fundamental Geology-the Geological cycle James Hutton and "Uniformitarianism" Plate tectonics Rock types-Igneous "from fire" from volcano-Sedimentary from erosion, laid down in layers, where find fossils James Hutton-Scottishg farmer, physician, natualist-"father of modern geology"-reasoned that if erosion wears down the land then must be process to build it back up-"uni" the idea that we can use our know of natural proc operating now to understand what occured in the distant past....idea that the earth must be very old....idea of a "rock cycle" The principle of Superposition: different layers (= sedimentary and rock strata) think of a sandwich, oldest layer on the bottom and newest on top, allows us the establish relative dates for the different strata Plate tectonics, theroy accepted in mid 20th cent, mechanism for hutton's rock cylce, continental drift...
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This note was uploaded on 04/14/2010 for the course BIO 88509 taught by Professor Hagen during the Spring '10 term at Kansas.
- Spring '10