Keywords: Apatosaurus ajax sacrum.jpg en Figure 1 ”Sacrum of Apatosaurus ajax Marsh; seen from below one-tenth natural size a first sacral vertebra; b transverse process of first vertebra ; c transverse processes of second vertebra; d transverse process of third vertebra; / foramen between first and second transverse processes; / ¢' foramen between second and third processes; p last sacral vertebra; g surface for union with ilium 1879 Immediate source http //marsh dinodb com/marsh/Marsh 201879 20- 20Principle 20characters 20of 20American 20Jurassic 20dinosaurs 20Part 20II pdf<br>Original source Marsh O C 1879 Principal Characters of American Jurassic Dinosaurs Part II American Journal of Science XVII 86 “92 Othniel Charles Marsh 1831 “1899 other versions PD-old-70-1923 Uploaded with UploadWizard Apatosaurus fossils |