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Showing results for tags 'guide fossil'.
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This is a nice fossil of the carpet shell. At first, this species, Venerupis senescens, was used as a guide fossil for the Eemian, the last interglacial age (so whenever paleontologists would find this species in a new location, they would know that they all the other fossils of the location are also Eemian). But this was later proven to be wrong.