THE PERMIAN SYSTEM IN KANSAS. 23 



Thickness. Depth. 



Neocene marl, sand and gravel 89 89 



Red sandstone and clay, with veins of water at inter- 

 vals. (A vein of salt water was cased out at 150 feet) 537 626 



Shales, almost wholly red, more or less saline S9 715 



Rock-salt, with small admixture of shale 30 745 



Salty red and blue shale (mostly red) 13 758 



Rock-salt, with small admixture of shale 22 7H0 



Shaly salt gradually becoming red and blue shale 20 800 



Red shale with some blue spots 50 850 



Rock-salt, with small admixture of shale 20 870 



Dark red shale, blue mottled 134 1004 



This section affords the only data here available with 

 which to indicate the thickness of the Salt Plain measures, 

 giving for the vertical range of the rock-salt 155 feet, 

 which, with a few feet added for transitional sediments 

 above and below, probably approximates the thickness of 

 these measm-es as developed at and near their outcrops in 

 Kansas. 



On another page of this article it is shown that if a 

 line be drawn between Ashland and a point about six miles 

 southwest of Medicine Lodge, the Medicine Lodge gypsum 

 dips in both directions (more or less nearly southward and 

 more or less nearly northward) from that line. A similar 

 relation to about the same line apparently obtains in the 

 Salt Plain measures, as these certainly dip from about this 

 line far southward into Oklahoma, and they have an appar- 

 ent dip of about 8 feet per mile from the same line to the 

 latitude of Pratt. 



The saline springs on the upper part of Little Mule 

 creek, in liarber county, Kansas; the great salt spring at 

 the head of Salt creek in Blaine county, Oklahoma, from 

 the brine of which several tons of table-salt are now made 

 daily, and which is said to furnish brine enough for the man- 

 ufacture of 160 tons a day: and (with less confidence) the 

 Salt plain of the wSalt fork in Woods county, Oklahoma 

 (sometimes known as the Little Salt plain) are provision- 

 ally referred to the Salt Plain measures. 



