Jiufotang Formation
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The Jiufotang Formation is an Early Cretaceous geological formation in Chaoyang, Liaoning which has yielded fossils of feathered dinosaurs, primitive birds, pterosaurs, and other organisms. (see Jehol Biota). It is a member of the Jehol group. The exact age of the Jiufotang has been debated for years, with estimates ranging from the Late Jurassic to the Early Cretaceous. He et al. (2004) used argon - isotope radiometry to confirm biostratigraphic age estimates. They confirmed an Early Cretaceous, Aptian age for the Jiufotang Formation, 120.3 +/-0.7 million years ago. Fossils of Microraptor and Jeholornis are from the Jiufotang.[1]

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Fauna

Birds and other theropods

Birds and other theropod dinosaurs of the Jiufotang Formation
Taxa Presence Description Images
An enantiornithine.
Jeholornis
Jeholornis
Microraptor
Microraptor
An ornithuran.
A primitive short-tailed bird (pygostylian).
An enantirontihine.
A long-tailed, basal avian.
A long-tailed bird similar to Jeholornis.
An enantirontihine.
An enantirontihine.
A possible enantiornithine.
A dromaeosaurid.
From the Shangheshou Beds, extremely common.[2]
A dromaeosaurid.[2]
An omnivoropterygiform, a primitive short-tailed bird.
An enantiornithine.
An ornithuran.
An ornithuran.
An ornithuran.

Choristoderans

Choristoderans of the Jiufotang Formation
Taxa Presence Description Images
Hyphalosaurus
Hyphalosaurus

Fish

Fish of the Yixian Formation
Taxa Presence Description Images
An osteoglossiform.
Lycoptera
Lycoptera
An osteoglossiform.
An osteoglossiform.
A fish related to Sturgeons.
A Paddlefish.
A Bowfin.

Ornithischians

Ornithischian dinosaurs of the Yixian Formation
Taxa Presence Description Images
A ceratopsian.
From the Shangheshou Beds, extremely common.[2]
A ceratopsian.[2]

Pterosaurs

Pterosaurs of the Jiufotang Formation
Taxa Presence Description Images
A chaoyangopterid.[3]
A chaoyangopterid.[3]
A chaoyangopterid.[3]
A tapejarid.[3]
A tapejarid.[3]
A tapejarid.[3]
A chaoyangopterid.[3]
An ornithocheirid.[3]
An istiodactylid.[3]
An istiodactylid.[3]
A tapejarid.[3]
A tapejarid.[3]

Sauropods

Sauropod dinosaurs of the Yixian Formation
Taxa Presence Description Images
An unnamed species of titanosaur.[2]

See also

References

  1. ^ a b He, H.Y., Wang, X.L., Zhou, Z.H., Wang, F., Boven, A., Shi, G.H., Zhu R.X. (2004). "Timing of the Jiufotang Formation (Jehol Group) in Liaoning, northeastern China, and its implications". Geophysical Research Letters 31(13): 1709.
  2. ^ a b c d e Xu, X. and Norell, M.A. (2006). "Non-Avian dinosaur fossils from the Lower Cretaceous Jehol Group of western Liaoning, China."Geological Journal, 41: 419-437.
  3. ^ a b c d e f g h i j k l Wang, X. and Zhou, Z. (2006). "Pterosaur assemblages of the Jehol Biota and their implication for the Early Cretaceous pterosaur radiation ."Geological Journal, 41: 405-418.
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