Chapter 1

Chapter 1 - Chapter2 18:12 WilliamSmith

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Chapter 2 18:12 William Smith Hired to find the best route for a canal for coal barges-discovered fossil and  that each stratum not only extended invisibly beneath the farms in the  distance but also maintained its place in the vertical succession of rock layers. How are fossils formed Plants and Creatures dead or living are covered in sediment (silt, mud, debris  etc) For preservation of soft parts quick burial is needed Niels Stensen a Danish physician formulated three basic principles of historical  geology from observing sedimentary rock: (3 principles are basic to the geologic  specialty of stratigraphy the study of layered rocks.) Superposition Original horizontality Original lateral continuity Principle of superposition States that in any sequence of undisturbed strata, the oldest layer is at the  bottom, and successively younger layers are successively higher. Does not always work because layers can be steeply tilted or overturned. In  these situations geologists must look for clues in recognizing their lowermost  and uppermost layers. Principle of original horizontality States that sediment is deposited in layers that are originally horizontal Principle of original lateral continuity States that a rock layer extends continuously in all directions until it thins out  or encounters a barrier John Strachey
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This note was uploaded on 09/28/2009 for the course GEOL 002 taught by Professor Brown during the Fall '09 term at GWU.

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Chapter 1 - Chapter2 18:12 WilliamSmith

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