Geography, 19.04.2020 17:46, michaelgg7166

Scientists found many different types of fossils in a rock layer, which was dated at 251–299 million years old using an index fossil. In layers directly above that point, scientists found a large decrease in the number of fossils, particularly of marine and insect fossils. When did the extinction event occur?

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Scientists found many different types of fossils in a rock layer, which was dated at 251–299 million...