104 THE UNIVERSITY OF OKLAHOMA 



wide and fifty to seventy-five miles long that passes through sev- 

 eral counties, among which were Cleveland, Oklahoma, and Lincoln. 



Partly within this area are situated the particular localities 

 noted in the following table. 



From what the writer can learn from a somewhat limited 

 field study, the barite of the red beds is of two distinct qualities 

 depending upon vi'hcthcr it vv^as deposited in shales and limestones 

 or in porous sandstones. 



Barite does not seem to so readily include argillaceous material 

 as arenaceous impurities consequently barite deposited in shales 

 maintain quite fully its chemical integrity while that deposited in 

 sandstones may be diluted with quartzitic sand to almost any ex- 

 tent. If tlie proportion is about 50 per cent, BaSO^ vvrill exert its 

 influence upon the outward form of the aggregate. With a greater 

 proportion of SiO„ this influence gradually becomes less until above 

 70 per cent sand is included when rhe presence of barite m.ay only be 

 inferred from the satiny saccharoidal appearance and an increased 

 specific gravity of the sandstone above its usual weight. 



Those impure' forms developed by deposition of BaSO^ in sand- 

 stone, 'known usually as sand barite rosettes, have been so carefully 

 described by Nichols* that they need no further mention other 

 than the citation of the literature and a tabulation of various analysis 

 available, which are as follows : 



Analj^ses of sand bar'te rosettes (Expressed in Percent). 



SiO., 36.99 45.13 45.20 



Al,6, 5.36 0.88 0.86 



Fe'Og 0.82 0.96 0.93 



MgO 0.03 0.00 0.00 



CaO 0.51 0.00 0.00 



H^O 0.27 0.31 0.36 



PgOg n. d. faint trace trace 



SO3 19.20 17.87 18.14 



MnO n. d. 0.02 0.02 



BaO 35.76 34.25 34.50 



SrO n. 'd. n. d. 0.00 



CO, n. d. 0.0 0.07 



Organic 0.32 n. d. n. d. 



Total 99.26 99.42 100.08 



Specific Gravity 3.38 3.36 3.36 



*Nichols, Herry Windsor "New Forms of Concretions". Publication 

 Number 111 Geological Series of Field Columbian Museum Vol. Ill No. 3, 



1906, Chicago. 



