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However, leg bone fossils of a similar bird were found in the Early Eocene Fur Formation in Denmark.
The Murgon fossil site is a paleontological site of early Eocene age in south-eastern Queensland, Australia.
Taken together, these fossils place the origin of the Papilionoidea in the latest Mesozoic or early Paleogene, while the extant families emerged approximately the early Eocene onwards.
The Willwood Formation is a sedimentary sequence deposited during the late Paleocene to early Eocene.