Road excavations inunearthed a trove of ancient fish fossils. As a part of rock layers known as thefilled with never-before-seen species that push back the dates of our first jawed animal ancestors by about 15 million years.
"Until this point, we've picked up hints from fossil scales that the evolution of jawed fish occurred much earlier in the fossil record, but have not uncovered anything definite in the form of fossil teeth or fin spines," says University of Birmingham paleobiologist Ivan Sansom.. A collection of about 20 teeth sifted from the rock bed could be up to 439 million years old.
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The oldest gnathostome teeth - NatureDirect evidence for the presence of jawed vertebrates in the early Silurian (around 439 million years ago) is provided by isolated tooth whorls of the gnathostome Qianodus duplicis from Guizhou province, China.
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