ITS WORTH TO THE STUDENT 



saw possible sources of carbonate of soda, magnesium sulphate 

 and asphalt for commercial use. 



An excellent chance was afforded petrographers for collect- 

 ing sedimentary rocks, representing geological periods all the 

 way from Tertiary to Ordovician, and crystallines from the Pale- 

 ozoic and Archean. 



The region traversed was not especially rich in mineral 

 wealth, yet there was opportunity to collect fine quartz of 

 many varieties, calcites and aragonites, graphite, gypsum and 

 various iron-bearing minerals. 



Invertebrate paleontologists fared even better than the 

 petrographers and mineralogists and the variety and quantity of 

 their collections were among the chief rewards of the expedition. 



The chief interest of the general public in the expedition 

 was in the vertebrate remains that were known to exist in the 

 various geological horizons. These the excursionists hoped to 

 see exhibited in position in bed rock and to have opportunity 

 to carry away with them to be used later for the convincing 

 of the incredulous. 



Jurassic dinosaurs were looked for with the greatest enthusiasm 

 and nearly every member of the party carried home some trophy, 

 even though it may not have been more than a small fragment; 

 and some members secured desirable material. The North- 

 western University party sent home about two tons of specimens, 

 the greater part of which consisted of the spinal column, ribs 

 and pelvic arch of a dinosaur that is probably the form known as 

 ceratosaurus. It was found in the Freezeout Hills, in the 

 region of the Platte Canon. The same party located reptilian 

 remains. But the absence of plaster and other means of saving 

 the materials, as well as the remoteness of the region, made work 

 in that locality appear undesirable. 



-19— 



