Yanliao Biota

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The Yanliao Biota: a Glimpse into Bird Origins and Other Oddballs of Jurassic China Filter feeding Pterosaurs What is the Yanliao Biota? One of the many organisms found in the Yanliao The Yanliao Biota is a collection of Biota were Pterosaurs, specifically filter-feeding organisms from northeast China that is dated pterosaurs which have not been previously known from the middle-late Jurassic Period, 160 from the Tiaojishan Formation nor earlier beds Ma, that’s famous for preserving animals of elsewhere7. Close study of the fossils of these 1 important evolutionary significance . The pterosaurs shows that the teeth, as shown below, are environment would have been cool and wet The Ancestors of Birds and their Color: closely spaced to form a ‘comb dentition’, a with seasonal changes and many plants while This collection is best known for having what is filter-feeding specialization7. The significance of mountain-building events, or Orogenies, are considered the ancestor of birds which are this finding is that this is the earliest record of a 1 going on in the background . Below are the dinosaurs similar to raptors called filter feeding pterosaur, which marks the initial step sites associated with this Biota dotted in Anchiornithines2. They are so well preserved of eco-morphological diversification of 1 blue . that some have the proteins that determine color pterodactyloids from insectivorous/piscivorous to a still on them3. On top is one, Anchiornis, variety of feeding adaptations7. restored in actual color3 and on bottom is Caihong, one that shows evidence for iridescence, or shiny feathers4. Prehistoric Mammals from the Yanliao Biota Among the collection of organisms found were mammals, mainly haramiyidian and euharamiyidians. Paleontologists have managed to recover many fossils that provide information on these mammals’ skeletal structure, particularly their skull shapes, tooth and jaws, and auditory bones. Figure 1 (left) is of A. allinhopsoni which shows the skeletal structure and impressions of body fur.5 Figure 2 (right) offers information on the tooth and jaw structure of a newly Vincent LoBiondo, Francesco Bertini, and discovered haramiyidian mammal from the site.6 Samantha Lam GEOL 204 The Fossil Record Spring 2019 Section 0105.

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First Turtle Remains from the Middle-Late Jurassic Yanliao Biota, NE China
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