782 THE JOURNAL OF GEOLOGY. 
sina Shumardiana, Spirifer like lineatus, Orthisina like umbraculum”’ 
exposed ‘‘near Fort Riley, Cottonwood and Fancy Creek.” * 
Swallow estimated the thickness of the beds between the fourth 
and third cherty limestones, which correspond to the beds between 
the top of the Strong and the base of the Florence flint, as ranging 
from forty-nine to sixty-eight feet which in our section is called sev- 
enty feet. Again, Swallow estimated the thickness of the beds rang- 
ing from the base of the fifth to the third cherty limestone, which 
represent the beds between the base of the Strong and Florence 
flints, as varying in thickness from 85 to 131 feet, while in the 
Chase formation they are assigned a thickness of 112 feet. 
Swallow reported six feet of shales above the Florence flint and 
then a massive limestone which he described as ‘‘a buff porous 
magnesian rock? in thick beds,” containing ‘‘Productus Calhounta- 
nus, Orthisina Shumardiana, Archeocidaris, Bakevellia, etc., eight 
to ten feet .... near Fort Riley, Cottonwood and Fancy 
Creek” for which he proposed the name ‘‘ Fort Riley hmestone.”’ 
On account of the excellent exposures near Junction City and 
Fort Riley, Swallow’s name, ‘‘ Fort Riley limestone,” is an appro- 
priate one for the Kansas Valley region, while in the Cottonwood 
Valley it is represented by the Florence limestone.3 
After comparing numerous sections, it does not appear that 
the massive ledge of limestone exposed in the various ravines 
and bluffs of this region always represents the same bed; in 
fact we also find that the higher shaly limestones appear in cer- 
t Prel. Rep. Geol. Surv., Kansas, p. 14. The “ Fancy Creek”? mentioned frequently 
‘by Professor Swallow is supposed to be the one north of the Kansas River in the 
northern part of Riley county. 
2This limestone contains a small percentage of magnesia as is shown by Mr. 
Finney’s analysis : 
SiO. - - = - 10.01 per cent. 
Al,O,  - - - = - oh Aan 
CaCO, - - - - S253 ” 
MgCo, - - - - oh (haa 
FeO. - = - S trace ss 
99-45“ 
CO, - - - - = 70.00 ™ 
3 For the first statement of this correlation see PROSSER; Bull. Geol. Soc., Amer., 
Wol. VI., p. 49 £ n. 
