714 CHARLES S. PROSSER 



Professor Hay in 1893 from exposures near Wreford, Geary 

 county, south of Junction. 1 The preceding report of the State 

 Board contained the same table of Professor Hay's "Fort Riley 

 section," except that this division was called the "Walford lime- 

 stone," which was undoubtedly a typographical error for 

 Wreford. 2 



Matfield shales. — The formation is composed principally of 

 variously colored shales, with some shaly buff, occasionally 

 cherty limestones, and a light gray limestone two feet or so in 

 thickness, which occurs about thirty feet below its top. The 

 thickness ranges from sixty to seventy feet, and it generally 

 forms covered slopes between two massive and conspicuous flint 

 ledges. It is named from Matfield township, Chase county, 

 where it forms the side of the steep escarpment above the 

 Wreford limestone. 



Florence flint. — This formation is about twenty feet in thick- 

 ness and consists of very cherty limestone separated by definite 

 layers of chert, with a band of shaly or white cellular limestone 

 near the center. It is excellently exposed on the McPherson 

 branch of the Atchison, Topeka & Santa Fe Railroad, and in 

 the Jones quarries along that railroad, from one to two miles 

 northeast of Florence, and on this account in 1895 it was named 

 the "Florence flint." 3 



Fort Riley limestone. — Overlying the Florence flint is a series 

 of massive buff limestones, changing to thin bedded and shaly 

 strata in the upper part of the formation, which have a total 

 thickness of forty feet or more. Near the center of the forma- 

 tion are generally one or two massive layers, which on the 

 weathered surface form a conspicuous ledge that may be readily 

 followed by the eye for miles on the bluffs of the Cottonwood 

 and Kansas rivers. Swallow in 1866 applied the term "Fort 

 Riley limestone " to the massive ledge in the vicinity of Fort 

 Riley, which he described as "a buff porous magnesian rock, in 

 thick beds," with a thickness of from eight to ten feet. 4 This 



^Eighth Bien. Rept. Kan. State Board Agri., Part II, p. 104. 



^Seventh ibid., 1891, Pait II, p. 94. 



3 Jour. Geol., Vol. Ill, p. 773. *Prel. Rept. Geol. Surv. Kansas, p. 14. 



