Rotundichnus is an ichnogenus of dinosaur footprint. The ichnospecies Rotundichnus muchehagensis dates to the early lower Cretaceous in central Laurasia (present-day Germany) and the largest footprint, that was 87 cm (2.85 ft) long, belongs to an individual that measured 21.5 meters (70.5 ft) and weighed 36.5 tonnes (40.2 short tons).[1]
Book: Glut, Donald F. . Dinosaurs: The Encyclopedia. 3rd Supplement . 2003 . McFarland & Company, Inc. . Jefferson, North Carolina . 0-7864-1166-X . Appendix: Dinosaur Tracks and Eggs . 613–652 . registration . https://archive.org/details/dinosaursencyclo00glut_2 .