Aurornis
Aurornis was described from a sedimentary rock fossil in 2013. The fossil was purchased from a local dealer who said it had been unearthed in Yaoluguo in western Liaoning, China. At first, analysis confirmed it came from the Tiaojishan Formation, which has been dated to the late Jurassic period, about 160 million years ago. The fossil features traces of downy feathers along the animal's tail, chest, and neck. It was only partly prepared at the time of purchase; the feathers were not showing, and the fossil bore no signs of forgery.