EAPS 11200 Lecture 9: 02042019
19 Feb 2019
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Document Summary
Concept of geologic time: two different frames of reference, relative dating. Placing geologic events in sequential order: only know the order, not how long ago a particular event occurred, relative dating has been used to establish a relative geologic time scale. Relative geologic time scale: eons, eras, periods, epochs. Changes in the concept of geologic time: concept of time has changed throughout human history, early christian theologians, conceived of time as linear rather than circular. James ussher (1581-1665) in ireland: calculated the age of the earth based on record history and genealogies in. John jolly - used the amount of salt carried by rivers, and the salinity of seawater: obtained a minimum age of 90 million years. Relative dating principles: steno"s three stratigraphic principles, nicolas steno (1638-1686) Beginning of modern geologic thought: clash of ideas, abraham werner (1749-1817) germany, neptunism, james hutton (1726-1797) england, plutonism.
