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M_W_Chapter_17-3_Fossils_short - Chapter 17-C Fossils M&R...

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Chapter 17-C Fossils M&R text: p. 485-489
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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
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What are Fossils? “fossil” – original definition – anything dug out of the ground Xenophanes (500’s B.C.) Fossil shells in rock quarries – sea must have covered all the land in the past Aristotle (300’s B.C.) Fossils formed in the rock by special rock properties The Church (until 1700’s) dogma tricks of nature or stars or of the devil Animals left behind by Noah’s Flood
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Diluvian Hypothesis All sedimentary strata were deposited by the biblical flood.
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Leonardo da Vinci Way ahead of his time! 1500 A.D. Clam-Shells on high mountains remains of once-living sea life not a result of Noah’s flood several different layers but only one flood clams can’t move around, could not have traveled 100s of km in 40 days. Shell beds formed and then uplifted during mountain building 1452-1519 www.ucmp,berkeley.edu/history/vinci.html
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Sketches by Hooke (1703) Fossils are remains of once-living animals and plants! - Hooke, Ray, Steno, late 1600’s
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PROBLEM! Fossils recognized as remains of marine animals found in the mountains Genesis tells us that God separated the land from the sea before He created life. 1700’s ANSWER: Fossils are result of Noah’s Flood Leonardo da Vinci had argued differently in 1500!
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Nicholas Steno 1638-1686 studied the geology in Tuscany
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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 Converted to Catholicism (became a bishop) and abandoned interest in science.
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