| 21. | Paleontologists regard this differace as the defining characteristic of mammalian fossils.
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| 22. | In 2009, paleontologist Mark Purnell conducted a Late Cretaceous period.
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| 23. | In 1985, American paleontologist William Akersten suggested the shearing bite.
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| 24. | Elkanah Billings became a naturalist and Canada's first paleontologist.
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| 25. | It was described by Soviet paleontologist A . Rozhdestvensky in 1968.
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| 26. | The first fossil was described by paleontologist Werner Janensch in 1914.
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| 27. | Later paleontologists have not agreed with Dong's original assessment.
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| 28. | He was also an amateur naturalist, paleontologist and watercolour painter.
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| 29. | It was studied by Soviet paleontologist A . N . Ryabinin.
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| 30. | The name honors U . S . paleontologist Henry Fairfield Osborn.
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