Rough drawing to show scale of size of Tyrannosaurus rex. This carnivorous dinosaur 

 was the largest beast of prey that ever lived. The Museum possesses one Tyrannosaurus 

 skeleton from South Dakota and two from Montana 



The 



Dinosaur 



Diplodocus 



Brontosaurus , 



SOUTHEAST PAVILION 



Fossil Reptiles axd Fishes 



The visitor now enters the Southeast Pavilion containing the dinosaurs 

 and other fossil reptiles and also fishes. These animals belong to a more 

 ancient period than the specimens just examined. They lived from 

 3,000,000 to 10,000,000 years ago. They include the 

 well-known dinosaurs of which the Museum has a large 

 collection. In the wall case on the left is a portion of the 

 skeleton of the dinosaur Diplodocus; this was the first of 

 these specimens to be unearthed by the Museum. 



The gigantic skeleton in the center of the hall is the huge extinct reptile, 

 the dinosaur Brontosaurus, found in the Jurassic beds of 

 Wyoming. It is the only mounted specimen of its kind in 

 the world and more than two-thirds of the skeleton is the original petrified 

 bone. It is sixty-six feet eight inches in length, sixteen feet in height and 

 is estimated to have weighed when alive thirty-five tons. Brontosaurus is 

 one of the largest giant reptiles and as is indicated by its teeth was her- 

 bivorous, probably living on the rank water weeds of the nearly sea-level 

 marshes of Wyoming. Contrasted with the herbivorous Brontosaurus, is 

 the carnivorous dinosaur Allosaurus, mounted to represent 

 the animal feeding on the fallen carcass of a Brontosaurus, 

 upon which it preyed. This is not a fanciful mounting for these very 

 skeletons were found in close proximity to each other in the Jurassic beds 

 of Wyoming, and the skeleton of the fallen Brontosaurus shows gouges 

 made by the teeth of Allosaurus as it tore the flesh from its victim. 



Near the Allosaurus group is a portion of a skeleton of Tyrannosaurus 



81 



Allosaurus 



