62 THE WHITE RIVER BADLANDS 



Analyses of Fullers' Earth From the Titanotherium Beds. 



Constituent 



Silica (SiO g ) 



Alumina (A1 2 3 ) 



Ferrous oxide (FeO) . . 



Lime (CaO) 



Magnesia (MgO) 



Loss on ignition 



Total 



a — Fe O 



2 3 



Per cent 

 68.23 

 14.93 

 3.15 

 2.93 

 0.87 

 6.20 



Per cent 



60.16 



10.38 



14.87 



4.96 



1.71 



7.20 



Per cent 



56.18 



23.23 



a 1.26 



5.88 



3.29 



tV 11.45 



96.31 



99.28 



101.29 



b — H O. 



Constituent 



4 



5 



6 



Silica (SiO ) 



Per cent 

 55.45 

 18.58 

 3.82 

 3.40 

 3.50 

 8.80 

 5.35 



Per cent 

 57.00 

 17.37 

 2.63 

 3.00 

 3.03 

 9.50 

 5.85 



Per cent 



58.72 



V 2 } 



Alumina (Al O ) 



16.90 



Ferrous oxide (FeO) 



4.00 



Lime (CaO) 



4.06 



Magnesia (MgO) 



2.56 



Loss on ignition 



8.10 



Volatile 





Alkali 



2.11 



Moisture 







2.30 











Total 



98.90 



98.35 



98.45 







Volcanic ash has been mentioned in the description of 

 the deposits. It occurs rather widely distributed over the 

 country. A prominent bed lies near the top of Sheep 

 mountain and extends outward from it for many miles along 

 the walls and the remnant buttes that are high enough to 

 retain it. Other beds are found near and within the 

 neighboring Black Hills and here some effort has been made 

 to place the material upon the market. Deposits of a 

 similar nature in Nebraska have been worked for many 

 years. The ash when not mingled with other sediment is 

 nothing more than minute angular fragments of natural 

 glass and these having sharp cutting edges give to the ash 

 a value as a polishing powder or in the prepared state is an 

 important constitutent of abrasive soaps. 



