Halcyornithidae or Pseudasturidae is a family of fossil birds, possibly belonging to the order Psittaciformes (parrots and relatives). Members of this family lived in the

Eocene The Eocene ( ) Epoch is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (mya). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name ''Eocene' ...

, around 55-48 million years ago. Fossil remains are known from the

Green River Formation The Green River Formation is an Eocene geologic formation that records the sedimentation in a group of intermountain lakes in three basins along the present-day Green River in Colorado, Wyoming, and Utah. The sediments are deposited in very fine ...

in the United States and from the

London Clay The London Clay Formation is a marine geological formation of Ypresian (early Eocene Epoch, c. 56–49 million years ago) age which crops out in the southeast of England. The London Clay is well known for its fossil content. The fossils from t ...

formation in the United Kingdom. They were probably the sister group to the owl-like

Messelasturidae Messelasturidae is an extinct family of birds known from the Eocene of North America and Europe. Their morphology is a mosiac that in some aspects are strongly convergent with modern hawks and falcons, but in others are more similar to parrots. ...

Classification

*'' Cyrilavis'' *'' Halcyornis'' *'' Pulchrapollia'' *'' Pseudasturides'' *''

Precursor Precursor or Precursors may refer to: * Precursor (religion), a forerunner, predecessor ** The Precursor, John the Baptist Science and technology * Precursor (bird), a hypothesized genus of fossil birds that was composed of fossilized parts of u ...

''? (probably a

chimera Chimera, Chimaera, or Chimaira (Greek for " she-goat") originally referred to: * Chimera (mythology), a fire-breathing monster of Ancient Lycia said to combine parts from multiple animals * Mount Chimaera, a fire-spewing region of Lycia or Cilicia ...

)

References

{{Taxonbar, from=Q49001519 Parrots Eocene birds Prehistoric birds of Europe Prehistoric birds of North America Prehistoric bird families