Dinosaur feather notes.

Wikipedia's dinosaur clades Saurischia and Ornithischia are the two basic sorts. 

Wikipedia on dinosaur feathers, maybe feathers arose with Ornithodira, the last ancestor of both pterosaurs and dinosaurs (which includes birds). 

Wikipedia's beautiful tree of life! 

Fossil feathers head to toe on a dromaeosaur, a close relative of velociraptor and thus, with Tyrannosaurus Rex, a part of the advanced therapods who have bones like modern birds (and sharp teeth not like them). (Science Daily, April 2001)

Tianyulong confuciusi, a feathered Ornithischia. Ornithischia includes armored herbivores such as Triceratops and Stegosaurus. (National Geographic News, March 2009)