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Based on fragmentary fossil remains, the two known species present in the Ashville Formation have not been given names, but overall were very similar to Ichthyornis dispar. I. dispar itself had a very long temporal range, and specimens referred to it or very similar species existed relatively unchanged (other than some fluctuations in average adult size) for nearly 10 million years, when species referable to I. dispar disappeared and were replaced by other, though still somewhat similar, species of

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