M_W_Chapter_17-2_Relative_Time_short

M_W_Chapter_17-2_Rel - Our Plan for Chapters 17& 18 • Chapter 17 – Geologic Time and Change(File 17-A – Relative Geologic Time(File 17-B

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Unformatted text preview: Our Plan for Chapters 17 & 18 • Chapter 17 – Geologic Time and Change (File 17-A) – Relative Geologic Time (File 17-B) – Fossils (File 17-C) – Absolute Geologic Time (File 17-D) • Chapter 18 – Evolution and Fossils Diluvian Hypothesis All sedimentary strata were deposited by the biblical flood. Nicholas Steno 1638-1686 studied the geology in Tuscany Steno • Recognized that fossil shark’s teeth really were from once-living sharks • 1669 book: – principle of superposition – principle of original horizontality – principle of original lateral continuity • Founder of Stratigraphy • Later converted to Catholicism, became a bishop and abandoned interest in science. What is Stratigraphy? • Reading the rock record to understand Earth’s history • The branch of geology that deals The branch of geology that deals • with the origin, composition, with the origin, composition, • distribution and succession distribution and succession • of sedimentary rocks. of sedimentary rocks. – Principle of superposition • In any succession of strata not deformed, the oldest lies at the bottom, with successively younger ones above • Oldest layer on bottom, youngest on top Wha t a re S te no ’s princ iple s ? – Principle of original horizontality • Because sedimentary particles settle from fluids under gravitational influence, most stratification originally must be horizontal; steeply inclined strata, therefore, have suffered subsequent disturbance S te no ’s princ iple s (c o n:-) –...
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This note was uploaded on 05/18/2011 for the course GEOL 106 taught by Professor Richter during the Spring '08 term at University of Louisiana at Lafayette.

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M_W_Chapter_17-2_Rel - Our Plan for Chapters 17& 18 • Chapter 17 – Geologic Time and Change(File 17-A – Relative Geologic Time(File 17-B

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