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Index fossils (also known as guide fossils or indicator fossils) are fossils used to define and identify geologic periods (or faunal stages).Index fossils must have a short vertical range, wide geographic distribution and rapid evolutionary trends.But they don't usually survive the erosional process to get to the surface' Of Sparks' discovery, Houde said: 'It was incredibly exciting because fossils in this condition are extremely rare.
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'We know that these fossils exist here underground.
His parents took a photo of the skull, and presumed it to belong to an elephant.
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