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At the dig site we begin by looking for exposed fossils. We dig slowly and carefully so we don't damage the specimen.Back in the lab, we can study the fossil more closely.All these labors have not led to a single unexpected finding such as a human fossil from the time of the dinosaurs, or a Jurassic dinosaur in the same rocks as Silurian trilobites.Paleontologists now apply sophisticated mathematical techniques to assess the relative quality of particular fossil successions, as well as the entire fossil record.

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He holds the Chair in Vertebrate Paleontology at the University of Bristol, UK, in addition to chairing the Masters program in paleobiology at the university.Older dates may change by a few million years up and down, but younger dates are stable.