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Nicholas Steno recognizes shark’s teeth fossils
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Nicholas Steno proposes Principle of Superposition (younger rock layers deposited on older rock layers)
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Robert Hooke compares fossils to extant life forms.
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William Smith proposes Principle of Faunal Succession (unique fossil sets in rocks succeed one another).
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James Hutton proposed that rocks cycle through Earth processes and that those processes happen slowly across vast periods of time (Theory of Uniformitarianism, proposed by William Buckland).
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Joseph Leidy creates Edestus genus Leidy paper
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Othniel Charles Marsh and Edward Drinker Cope search for dinosaur fossils and new dinosaur species.
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Mr. Davis finds fossil in Western Australia
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Henry Woodward classifies Australian fossil as new species Edestus davisii
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Russian geologist Karpinsky determines spiral fossils from Ural Mountains in Russia to be new genus and species - Helicoprion bessonowi, and renames Australian fossil Helicoprion davisii. Includes sketch of Helicoprion, Public Domain
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Helicoprion ferrieri identified by Karpinsky - now three species (Australia, Russia and Idaho)
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Idea that lead to theory of plate tectonics
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The fossil (IMNH 37899) that would later be scanned by Jesse Pruitt was discovered in a mine near Montelier, ID
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Bendix describes possible jaw material on fossil specimen Idaho 4. Also describes 9 other Helicoprion fossil specimen. Publishes findings on Idaho fossils in 1966.
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Ray Troll becomes intrigued with Helicoprion after seeing fossil in collections at L.A. County Museum.
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Jesse Pruitt first sees Helicoprion fossil in Idaho Museum basement
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Jesse Pruitt drives fossil specimens to Texas to be CT scanned.
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Ray Troll, Cheryl Wilga, Jason Ramsey and Alan Pradel meet with Jesse Pruitt and Leif Tapanila in Idaho to examine fossils and scans.
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