Temporal range: Late Cretaceous, 66 Ma
Olson & Parris, 1987
Tytthostonyx is a genus of prehistoric seabird. Found in the much-debated Hornerstown Formation which straddles the Cretaceous–Paleogene boundary 66 million years ago, this animal was apparently closely related to the ancestor of some modern birds, such as Procellariiformes and/or "Pelecaniformes". A single species is placed herein, Tytthostonyx glauconiticus.
- Olsen, S. and Parris, D.C. (1987). "The Cretaceous Birds of New Jersey." Smithsonian Contributions to Paleontology, 63: 22pp.
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