Helicoprion

By MGID
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    Helicoprion Research

  • First fossils recognized

    Nicholas Steno recognizes shark’s teeth fossils

  • Principle of Superposition

    Nicholas Steno proposes Principle of Superposition (younger rock layers deposited on older rock layers)
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    Comparative Anatomy

    Robert Hooke compares fossils to extant life forms.
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    Principle of Faunal Succession

    William Smith proposes Principle of Faunal Succession (unique fossil sets in rocks succeed one another).
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    Rock Cycle and Theory of Uniformitarianism

    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).

  • Genus Edestus created

    Joseph Leidy creates Edestus genus Leidy paper
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    Dinosaur "Bone Wars"

    Othniel Charles Marsh and Edward Drinker Cope search for dinosaur fossils and new dinosaur species.

  • 1st Helicoprion fossil found

    Mr. Davis finds fossil in Western Australia

  • 1st Helicoprion fossil classified as Edestus davisii

    Henry Woodward classifies Australian fossil as new species Edestus davisii
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    Late 1800's - Spiral fossils found in Russia (Ural Mountains)

  • Helicoprion named by Karpinsky

    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

  • 3rd species of Helicoprion identified

    Helicoprion ferrieri identified by Karpinsky - now three species (Australia, Russia and Idaho)

  • Continental drift proposed by Alfred Wegener

    Idea that lead to theory of plate tectonics

  • Fossil called Idaho 4 discovered

    The fossil (IMNH 37899) that would later be scanned by Jesse Pruitt was discovered in a mine near Montelier, ID
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    Idaho 4 fossil jaw material identified

    Bendix describes possible jaw material on fossil specimen Idaho 4. Also describes 9 other Helicoprion fossil specimen. Publishes findings on Idaho fossils in 1966.

  • Ray Troll first sees Helicoprion fossil

    Ray Troll becomes intrigued with Helicoprion after seeing fossil in collections at L.A. County Museum.

  • Reconstruction of tooth whorl in lower jaw by Long

    Tooth whorl in lower jaw

  • Jesse Pruitt decides to study Helicoprion

    Jesse Pruitt first sees Helicoprion fossil in Idaho Museum basement

  • Helicoprion Idaho 4 fossil CT scanned

    Jesse Pruitt drives fossil specimens to Texas to be CT scanned.
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    Shark Summit in Idaho

    Ray Troll, Cheryl Wilga, Jason Ramsey and Alan Pradel meet with Jesse Pruitt and Leif Tapanila in Idaho to examine fossils and scans.

  • Biology Letters paper published

  • Cover article in Journal of Paleontology

  • Saws for Jaws published in Journal of Morphology