48 C. S. PROSSER PERMO-CARBONIFEROUS AND PERMIAN ROCKS. 



Professor Robert Hay,* and thus the relation of the Manhattan section 

 to the one at Fort Riley is shown.f This flint bed forms number 5 of 

 Professor Hay's section at Fort Riley, 40 feet above the base of the sec- 

 tion which he called " the lower flint beds " and for which the name 

 " Wreford limestone " was proposed. The Professor stated that the bed 

 was worked for lime at Wreford, south of Junction City, and also noted 

 its occurrence near the top of the bluffs at the eastern edge of the Fort 

 Riley Military Reservation. This is the locality mentioned above, and 

 if for any reason the local name of Wreford limestone should not prove 

 desirable, on account of the prominence of this ledge near Ogden, it 

 might appropriately be called the Ogden flint. 



FORT RILEY SECTION. 



Professor Hay^s Investigations. — Professor Hay has prepared a geologic 

 map and report upon the Fort Riley Military Reservation, now passing 

 through the press, which will give the local particulars of the Fort Riley 

 and Junction City region; consequently we will only mention the most 

 important geologic characters of this region, and refer the reader to 

 Professor Play's paper for a detailed account. It is interesting to observe 

 the points of agreement between these several sections, the more notice- 

 able of which we will briefly mention. 



Second Flint Bed and its Correlatives. — A higher flint bed, forming num- 

 ber 9 of Hay's section, is composed of limestones containing numerous 

 flint nodules, separated by layers of flint. In the Fort Riley «section, 

 from the base of number 5 (Wreford limestone) to the base of number 

 9 is 77 feet, according to Professor Hay's section. This upper flint is 

 bed 14 of Meek and Hayden, and from its base to the base of the lower 

 flint (number 18) is 107 feet. Swallow noted the same stratum, which 

 is bed 54 of his section, or what he called the "third cherty limestone," 

 and he gives the thickness of the beds corresponding to that given in the 

 two preceding sections as varying from 85 to 131 feet. 



Fort Riley Limestone and its Correlatives. — Near the summit of the hills 

 about Fort Riley is a conspicuous stratum, number 11 of Professor Hay's 

 section, which he called "the Fort Riley main ledge, a buff magnesian 

 limestone," 6 feet in thickness, and on this rests number 12, " buff lime- 

 stones with shale partings, changing to shales with limestone ledges " from 

 30 to 40 feet thick. 



* Seventh Bien. Report Kansas State Board Agri., vol. xii, 1891, part I, p. 94. Eighth ibid., vol. xiii, 

 1893, part II, p. 104. 



t Professor Hay, in his table of" the rocks of Kansas," used the term " Manhattan beds," but 

 stated that "what T have called Manhattan beds in the geological scheme I have not had the 

 opportunity to work out in detail " (Eighth Bien. Report, pp. 101, 104). 



