Sinosauropteryx prima
Sinosauropteryx prima is a wonderful example of a feathered dinosaur. A relative abundance of feathered dinosaurs and early birds has been found in the Jehol Group of northeastern China.
The most famous & most frequently illustrated Sinosauropteryx specimen is the holotype, which consists of part & counterpart slabs (see the holotype part slab depicted below). The dark fringe running down the neck, back & tail represents feathers. It's a relatively small theropod dinosaur from the lower Yixian Formation (near-lowermost Cretaceous). It was excavated from the Sihetun Quarry (Shangyuan, Beipiao City, Liaoning Province, northeastern China).
This was the first feathered dinosaur ever discovered. It was formally named & described in 1996 (see Ji & Ji, 1996, Chinese Geology 10(233): 30-33).