chapter_08_lec modified

chapter_08_lec modified - Time and Geology Physical Geology...

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Steve Kadel, Glendale Community College Time and Geology Physical Geology 11/e, Chapter 8
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The Age of the Earth Prior to the 19th century, accepted age of Earth based on religious beliefs ~6,000 years for Western culture (Biblical) Old beyond comprehension (Chinese/Hindu) James Hutton , the“father of geology”, realized geologic processes require vast amounts of time Charles Lyell popularized Hutton’s concepts in book Principles of Geology Uniformitarianism / actualism : same processes operating in past are operating at present - “ The present is the key to the past
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Relative vs. Numerical Age Relative age - the order of events or objects, from first (oldest) to last (youngest) Determined by applying simple principles, including original horizontality, superposition, lateral continuity, cross-cutting relationships, inclusions, unconformities, and correlation of rock units and fossils Numerical age - the age of events or objects, expressed as a number or numbers Determined using radiometric dating (determining how much radioactive decay of a specific element has occurred since a rock formed or an event occurred)
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Relative Age Determination Contacts - surfaces separating successive rock layers (beds) Formations - bodies of rock of considerable thickness with recognizable characteristics
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This note was uploaded on 06/13/2011 for the course GEOL 1403 taught by Professor Mulcahey during the Spring '11 term at Lone Star College System.

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chapter_08_lec modified - Time and Geology Physical Geology...

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