Geological Papers. 249 



6. Light-gray, ash-colored and red clays, sometimes arenaceous, 



and often traversed by cracks filled with calcareous matter 

 as in the bed above— alternating vi^ith thin layers and seams 

 of gypsum. Locality, near the mouth of the Smoky Hill 

 \_Solomon1 river 40 feet. 



7. Rather compact amorphous white gypsum, with near the base 



disseminated crystals, dark colored, do. Locality, same as 



last 4i to 5 f t. 



8. Alternations of ash-colored, more or less arenacous clays, with 



thin beds and seams of gypsum above ; towards the lower 

 part, thin layers of claystone, and at some places soft mag- 

 nesian limestone. Locality, same as last 50 feet. 



9. Rough conglomerated mass, composed of fragments of magne- 



sian limestone and sandstone, with sometimes a few quartz 

 pebbles, cemented by calcareous and arenaceous matter; va- 

 riable in thickness and probably local. Locality, south side 

 of Smoky Hill river, ten or twelve miles below Solomon's 

 Fork seen, 18 feet. 



10. Bluish, light-gray and red laminated clays, with seams and beds 



of yellow magnesian limestone, containing Monotis hawni, 

 Myalinaperattenuata, Pleurophorus? subcuneata, Edmondia? 

 calhouni, Pecten undet., and Spirigera near S. subtilita; also 

 Nautilus eccentricus, Bakewellia parva, Leda subscitula, 

 Axinus rotundatus, and undetermined species of Bellerophon, 

 Murchisonia, etc. Locality, near Smoky Hill river, on high 

 country south of Fort Riley, as well as on Cottonwood creek, 90 feet. 



11. Light-grayish and yellow magnesian limestone in layers and 



beds, sometimes alternating with bluish and other colored 

 clays, and containing Solemya, a Myalina near M. squamosa, 

 Pleurophorus? subcuneata, Bakewellia parva, Pecten undet., 

 and a Euomphalus near E. rugosus; also a Spirigera allied to 

 S. subtilita, but more gibbous, Orthisina umbulacrum?, 

 O. shumardana, etc. Locality, summit of the hills, near Fort 

 Riley and above there; also seen on Cottonwood creek. . . 25 to 35 feet. 



12. Light-grayish yellow, rather granular magnesian limestone, 



containing spines and plates of Archieocidaris ; a few frag- 

 ments of small crinoid columns, Spirifer, similar to S. lin- 

 eatus, but perhaps distinct; also same Spirigera seen in the 

 beds above, Orthisina] shumardana, O. umbulacrum? and 

 Productus calhounianus. Forms distinct horizon near sum- 

 mit of hills in vicinity of Fort Riley; also seen on Cottonwood 

 creek 7 to 8 feet. 



13. Soft argillo-calcareous bed, apparently local. Kansas Flaas. . 5 feet. 



14. Light grayish yellow magnesian limestone, containing many 



concretions of flint ; also the same Spirigera found in the 

 rocks above, Productus norwoodi, P. calhounianus with Dis- 

 cina tenuilineaia, and an undetermined Monotis. Fort Riley 

 and below; also at Kansas Falls and on Cottonwood creek. . . 38 feet. 



