GEOLOGICAL PAPERS. 151 



The same author, on page 82, refers to a stone quarried in section 

 28, township 19, range 11, as the Emporia limestone. Careful obser- 

 vation has proven that the formations at the locations mentioned are 

 three different strata, the first being separated from the later by about 

 sixty feet of shale, and the later from the one found at the water- works 

 by ten feet, making in all, including the limestones, a thickness of 

 eighty-six feet included within the formation he calls the Emporia 

 limestone. 



In a paper read before this Academy previously, I suggested the 

 name "Emporia blue limestone" for the lower stone mentioned by 

 Kirk, and that the name "Emporia" be retained for the system of 

 five limestones, sixty feet above. The name "Emporia limestone" 

 would thus include the formation quarried in section 28 and the one 

 found at the Emporia water-works. 



It was thought at that time that the word "blue" added to "Em- 

 poria" in the former instance would be a sufficient distinction to pre- 

 vent confusion, but on more careful study the blue stone is found to 

 be the more important of the two, being more persistent stratigraphic- 

 ally and much more valuable commercially. As the blue color of the 

 stone under discussion is a very prominent characteristic, it seems de- 

 sirable to retain that portion of the name. But to avoid any possibil- 

 ity of confusion in the future, I now propose the name "Reading blue 

 limestone" to be applied to the formation. 



As this stone lies within the Olpe shales as defined by George I. 

 Adams on page 52 of the United States Geological Survey Bulletin 

 No. 211, it seems necessary to either supply new names for the shales 

 above and below this stone or restrict the extent of the Olpe shales to 

 one portion or the other. I will therefore propose the name "Hum- 

 phrey shales" for the beds of shales and limestone forty to forty-five 

 feet in thickness between the Burlingame or Barclay limestone and the 

 Reading blue ; and that the name "Olpe shales" be applied to the 

 sixty feet of arenaceous and carbonaceous shale overlying the blue 

 stone and extending up to the Emporia system of five stones. 



This leaves the upper limit and the thickness of the Olpe shales 

 the same as originally given by Adams, but the lower limit is changed 

 from the Barclay to the Reading blue stone. 



OUTCROP. 



The outcrop of the blue limestone, as shown in plate XXIII, enters 

 Lyon county from the south in section 32, township 21, range 11, 

 and extends northwesterly along the sides of the hills and bluffs on 

 the west side of Rock creek about one and one-half miles, to a point 

 where it passes under the stream ; thence easterly it skirts the hills 

 and bluffs of Moon creek, Tate's branch and Smith creek and nu- 



