# Atreipus

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***Atreipus*** is an [ichnogenus](/source/Ichnogenus) or trace fossil attributed to early Ornithischian dinosaurs. Its significance for Triassic biostratigraphy has earned it some fame. Reptile footprint faunules from the early Mesozoic Newark Supergroup of eastern North America.[1]

## See also

- [Ichnology](/source/Ichnology)

## References

1. Olsen, Paul E. & Baird, Donald (1986). ["The ichnogenus *Atreipus* and its significance for Triassic Biostratigraphy"](https://www.ldeo.columbia.edu/~polsen/nbcp/olsen_baird_86.pdf). *The Beginning of the Age of Dinosaurs: Faunal Change Across the Triassic-Jurassic Boundary*. Padian, Kevin (ed.). New York: [Cambridge University Press](/source/Cambridge_University_Press). pp. 61–87. ISBN 978-0521367790. Retrieved 2024-12-27.

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