102 THE UNIVERSITY OF OKLAHOMA 



different phases can be seen plainly at the place mentioned. Inas- 

 much as the seams in the clay are not wide, the veins of mineral are 

 thin and hence are generally extended in two dimensions, the joint- 

 ing being distant compared with the thickness of the original vein. 

 If the interstitial clay should be washed away these flat nodule,^ 

 would settle in plates *or laminae, according to the position of their 

 centers of gravity, and form layers which if subsequently cemented 

 would show the characteristics of the well known plate rock phos- 

 phates. 



'"0>e interested in phosphate in Oklahoma, are referred to 

 the following: 



Oklahoma Geological Survey Bulletin, No. 3, p. 60. 



United States Geological Survey Folio, No. 122. 



University of Texas Bulletin, No. 1814, p. 64; which mentions 

 phosphatic material in the Wichita beds of the Permian in the 

 adjacent state of Texas. 



The writer is continuing the investigation of these interesting- 

 nodules and hopes to be able to present in the near future some data 

 regarding the nodules of the Permian Red B«ds. 



Summarizing : The present oaper calls attention to the fact 

 that phosphate rock exists in Oklahoma, points out a locality where 

 it occurs, presents an analysis of the material, and offers an explana- 

 tion as to the method of its formation. 



XIX. NOTES ON BARITE IN OKLAHOMA WITH 



CHEMICAL ANALYSES OF SAND BARITE ROSETTES 



A. C. Shead 



From the Oklahoma Geolog'cal Survey. 



Notwithstanding the fact that barite and especially the form 

 known as "sand barite rosettes," has long attracted attention as 

 one of the m.ost widely disseminated of Oklahoma minerals, yet 

 little definite progress has been made in working out the extent of 

 its areal distribution, the methods of its genesis,- or the geological 

 significance of its presence in the rocks. 



Before any of these general questions can be answered a 

 great amovmt of detailed work, both in the field and in the labora- 

 tory, will have to be done and it is the purpose of this paper to 

 present a short summary of the accomplishment recorded up to 

 the present time. 



The only statement regarding the areal extent of the deposits is 

 a verbal one, attributed to C. N. Gould in which it was said that 

 the barite occurs in an outcrop of red sandstone about ten mile 



