80 Kansas Academy of Science. 



one of the two must give way to Swallow's Stanton unless 

 priority be entirely ignored. 



Vilas Shales.'' — The name Vilas shales is used to designate 

 the shales lying just above the Allen limestone and below the 

 Stanton. When it was first named by Adams its exact position 

 was not known, and yet Adams was correct in giving its loca- 

 tion. The error consisted in a wrong discussion of the lime- 

 stones. Adams thought that the lola limestone extended south- 

 westward, capping the hills at Neodesha, and that, therefore, 

 the Vilas shales lay under the lola. In this particular area he 

 mistook the Allen for the lola. This error followed him in all 

 of his publications, even to his latest map of the lola quad- 

 rangle, United States Geological Survey Bulletin No. 238. 

 The shale-bed about Vilas to which he attached the name is 

 now known to lie on top of the Allen limestone, forming a nar- 

 raw zone extending practically across the state. 



StantoK Limestone." — The name Stanton limestone is used 

 to designate the limestone first above the Vilas shales. Swal- 

 low gives its locations as follows: "This limestone is well ex- 

 posed in the eastern bluff of the Marais des Cygnes, in the 

 highest points north of 'The Devil's Backbone,' above Stanton." 

 There can be no doubt, therefore, regarding his exact use of 

 the term at this place. However, he may have been led into 

 error in correlating it with other limestones in other parts of 

 the state. This is the same limestone formation named Piqua 

 by Adams,'' as has been abundantly proved by the most careful 

 field-work. 



DOUGLAS STAGE." 



The Douglas stage is divided into the following subdivisions, 

 namely, Le Roy shales, Kickapoo limestone, Lawrence shales, 

 and Oread limestone. 



Le Roy Shales.'" — The name Le Roy shales is used to desig- 

 nate the shales first above the Stanton limestone and first below 

 the Kickapoo limestone. In 1894 Ha worth and Kirk recog- 

 nized them in their section along the Neosho river. Later they 

 were supposed to be correlated with the Lawrence shales, so 

 well exposed farther north. In those days of imperfect corre- 

 lation it was difficult to determine just what were their equiva- 



36. Adams, Dr. Geo. I., Kan. Univ. Geol. Surv., vol. Ill, p. 51, Lawrence, 1898. 



37. Swallow, Dr. G. C, Geol. of Kan., p. 75, Lawrence, 1866. 



38. Adams, Dr. Geo. I., U. S. G. S. Bull. 238, p. 20, Washington, 1904. 



39. Haworth, Prof. E., Kan. Univ. Geol. Surv., vol. Ill, p. 93, Lawrence, 1898. 



40. Haworth & Kirk, Kan. Univ. Quart., vol. II, p. 110, Lawrence, 1894. 



