Imagine you are looking at an outcrop of shale that has several identifiable fossils in it. One species is known to have lived from 544 to 505 million years ago and another is known to have lived between 520 and 248 million years ago. What can you say about the age of your shale that contains fossils of both?
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Imagine you are looking at an outcrop of shale that has several identifiable fossils in it. One spec...
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