The 21 texts were originally compiled and edited by New York artist Allan McCollum to accompany his 1991 sculpture project, Natural Copies From The Coal Mines of Central Utah, as handouts to the gallery visitors. Dinosaur Footprints in Coal . Another site discussing the above hadrosaur tracks in coal. Also a short writeup on the subject. Dinosaur Tracking Field Trips Dinosaur tracks belong to that category of fossils known as traces fossils.
Trace fossils are different from body fossils which represent the actual remains of an animal.
Web Site - Terry Acomb's Dino Track Photos. Short but interesting web site on dinosaur tracks. Has a series of nice photos on tracksites in Colorado and Utah. A new study of dinosaur footprints preserved in three dimensions finds similarities and differences between modern-day fowl and ancient theropods. The study's authors still believe birds evolved from dinosaurs.