Archive: https://archive.today/f2Lo4 From the post: >>The footprints were of similar age, about 120 million years old, and were pressed into mud and silt of ancient riverbanks and lakeshores. Most of the prints—also known as trace fossils, since they are merely a trace of the animals that made them—were created by theropods, a group of bipedal, three-toed carnivorous dinosaurs. Some of the most famous dinosaurs included in the sets were theropods like Tyrannosaurus rex and Allosaurus. Other tracks included hundreds of prints belonging to sauropods (think big boys like Brontosaurus) and ornithischian dinosaurs, so-named for their bird-like hip bones.