| 41. | Fossils from the shale have been invaluable for studying the rapid diversification of life's anatomical designs in the Cambrian period.
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| 42. | Its species lived from 501 to 490 million years ago during the Dresbachian faunal stage of the late Cambrian Period.
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| 43. | Coprolites have been recorded in deposits ranging in age from the Cambrian period to recent times and are found worldwide.
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| 44. | It is in diameter and is estimated to be less than 500 million years old ( Cambrian period or earlier ).
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| 45. | The various species lived from 501 to 490 million years ago during the Dresbachian faunal stage of the late Cambrian Period.
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| 46. | In the Cambrian period, however, there were few scavengers to disturb the creatures once they were grounded and buried, Hagadorn said.
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| 47. | Tests are known as fossils as far back as the Cambrian period, and many marine sediments are composed primarily of them.
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| 48. | Most shells of marine molluscs fossilize rather easily, and fossil mollusc shells date all the way back to the Cambrian period.
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| 49. | This was true during the Cambrian Period, but the same event also happened approximately 66 million years ago but not as severely.
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| 50. | A new Cambrian Period fossil bed was discovered more than a year ago in China, complementing a bed in Canada, Ross said.
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