478 



SAMUEL WEIDMAN 



the grooving incidentally in connection with a detailed description 

 of the granites. It should be stated also, that the present writer 

 has not yet seen all the examples of grooved granites reported to 

 occur in the area. 



The granite shown in the following illustrations is medium to 

 coarse grained, of uniform granite texture, without any Hues of 



R.ZIW. 



R.ZOW. 



R.I9W. 



R.I8W. 



Fig. 7. — Sketch map of western part of Wichita Mountains. Shaded areas 

 represent granite mountains, unshaded the plains of the Permian Red Beds. 



structure or banding developed in it, excepting the numerous irregu- 

 lar joints and joint cracks that extend throughout. The grooves 

 and flutings, therefore, depend in no way upon structural features 

 of the granite formation. 



The distribution of the grooved granites is Hmited to the lower 

 slopes of the mountains about 100 feet above the lowest lands imme- 

 diately adjacent. In their occurrence they are in close proximity 



