That clanking sound you just heard was pretty much the entire field of paleontology evolutionary biology wired humanity dropping a solid gold brick: Tianyulong , a basal ornithischian from (where else?) China, has been found with dino-fuzz (Zheng et al. 2009). Not exactly protofeathers, but pretty darn similar. And if they’re in theropods and ornithischians, they were probably primitive for Dinosauria (at least;