http://www.newsweek.com/preserved-dinosaur-skin-100-million-years-korea-1393230

Researchers have uncovered dinosaur skin traces inside a set of one-inch-long footprints near Jinju—a city in South Korea.

Finding well-preserved dinosaur soft tissue, such as skin and bones, is a rare occurrence. In fact, far less than one percent of dinosaur tracks contain any kind of skin traces.