BUFFALO MOUND SECTION. 41 



Dip of the Manhattan Stone. — The ^lanhattan stone may be easily traced 

 from INIanhattaii up the Kansas river to Seven-mile creek, where there 

 is a good exposure on the creek bank by the highway just east of Ogden, 

 with the yellow fossiliferous shale on top. Another exposure occurs a 

 short distance east of the Manhattan and Ogden highway, near the Union 

 Pacific railroad, 15 feet higher than the track. This localit}^ is nine miles 

 southwest of Blue mount, at Manhattan, and there is an api)roximate 

 difterence of 110 feet in the altitude of the Manhattan stone, which gives 

 a dip of 12 feet to the milc.-'^ 



Meek and Hayden found the dip of a higher stratum extending from 

 the vicinity of Ogden to Cha})man's creek, 23 miles southwest, to be a 

 little less than 14 feet to the mile.f 



The greatest dip is supposed to be to the northwest, and the Manhat- 

 tan stone traced in that direction along the Chicago and Rock Island 

 railroad up Wildcat creek would pro])ably give a greater dip, possibly 

 20 feet to the mile, as suggested by Meek and Hayden. 



The Mill Creek geologic Section. 

 buffalo mound section a xd fauna. 



Professor Swallow, as well as ^leek and Hayden, frequently referred to 

 the exposures of rocks along Mill creek, a tributary of the Kansas river 

 southeast of Manhattan. The rocks for a considerable distance below the 

 Manhattan stone, and above it extending into the " flint series," are well 

 exposed in bluifs along the creek. On the south side of the creek, three 

 miles southwest of ^Iai)le Hill, is a prominent hill called Buffalo mound. 

 The top of the hill is between 350 and 3(50 feet above the level of i\[ill 

 creek. ^leek and Hayden gave a detailed section of the mound. J At 

 present it is not possible to clearly determine all the beds described by 

 ^leek and Ha3^den in the lower part of the section, although the most 

 important strata are fairly well defined. About 160 feet below the to}) 

 of the mound is a ledge of bluish gray limestone, which is ex])osed on 

 the road southeast of the mound and forms a conspicuous ledge for some 

 distance on l)()th sides of the road. This stratum is (|uitc fossiliferous 

 and is prol)al>ly l)ed number 2 of ]\Ieck and Hayden's section, although 

 it may belong in the lower part of their bed number 1. The following 

 species were collected from the exposure on the highway : 



♦Gannett (Bull. U. .S. Geol. Surv., No. Tfi) gives the elevation of Manhattan as 1,014 feet. The 

 Manhattan stone on Blue mount i.s approximately 173 feet above the railroad level, or 1,187 feet 

 above tide. Ogden ir* given as 1,002 feet, making tl»o approximate elevation of the Manhattan 

 stone 1.077 feet above tide, which would give a difference of 110 feet in the elevation of the Man- 

 hattan stone at the two localities. 



tProc. .\cad. Nat. Sci., Pliila., vol. xi, p. 22. 



t Ibid., pp. 12, 13. 



