SOUTH DAKOTA SCHOOL OF MINES 61 



rowing rodents within the corkscrews. ( See Figures 15 and 

 53). 



Figure 15 — Field sketch of a weathered rhizome containing the type 

 specimen of the burrowing rodent, Steneofiber barbouri. Peter- 

 son, 1905. 



ECONOMIC MINERAL PRODUCTS 



The White River badlands have not attracted par- 

 ticular attention as a source of mineral wealth. Sand- 

 stones and limestones are found in various places but they 

 seldom meet the requirements of a high grade building 

 stone. They are nearly always thin-bedded and generally 

 are more or less argillaceous. The sandstones are often of 

 coarse or irregular texture and poorly cemented. 



Clays occur in unlimited abundance and analyses show 

 that they could be utilized if desired, in various ways, par- 

 ticularly in the manufacture of brick and cement. Some 

 of the clays especially those near the bottom of the Titan- 

 otherium beds have the property of decolorizing or clarify- 

 ing oils, hence are known as fullers earth. 



Prof. Heinrich Ries of Cornell University, gives the 

 following analyses for the localities mentioned, analyses 1, 

 2, 3, 6 being of material from near Fairburn, and analyses 4 

 and 5 of material from near Argyle. 



