784 THE JOURNAL OF GEOLOGY. 
Swallow and represent those which we have described as the 
Chase formation, with a thickness of 265 feet. The Chase forma- 
tion is confined to what Swallow called the Lower Permian, and 
he drew the line separating the Lower from the Upper Permian 
at the top of bed No. 31 which he gave as from 49 feet 1 inch 
to 82 feet 3 inches higher than the bed which we regard as rep- 
resenting the top of the Chase formation. 
Comparison with Meek and Hayden.—The Strong flint corres- 
ponds to bed No. 18 of Meek and Hayden, which they described 
as a “light gray and whitish magnesian limestone containing 
Spirigera, Orthisina umbraculum (?), O. Shumardiana, Productus 
Calhounianus, Acanthocladia americana and undetermined sp. Cyatho- 
crinus; lower part containing many concretions of flint. Fort 
Riley and on Cottonwood Creek, whole thickness about 40 feet ; 
while in the Chase formation we have called it 42 feet. Again, 
the Florence flint is bed No. 14 of Meek and Hayden, which they 
give as 38 feet thick, while the Florence or Fort Riley massive 
YT 
limestone is No. 12, which they state ‘forms distinct horizon 
near summit of hills in vicinity of Fort Riley, also seen on Cot- 
tonwood Creek —7 to 8 feet.” Number 11 of Meek and Hay- 
den represents the shaly limestones above the massive Florence 
limestones (No. 16 of the Chase section) which they describe as a 
‘light grayish and yellow magnesian limestone in layers and beds, 
sometimes alternating with bluish and other colored clays, and 
containing Solenomya, a Myalina near squamosa, Pleurophorus (?) 
subcuneata, Bakevellia parva, Pecten, undt., and a Euomphalus near 
E. rugosus ; also a Spirigera allied to S. subtlita but more gibbous, 
Orthisina umbraculum (?), O. Shumardiana, etc. Locality, sum- 
mit of the hills near Fort Riley and above there; also seen on 
Cottonwood Creek—25 to 35 feet.” Meek and Hayden gave 
the thickness of the beds from the base of the lower flint— No. 
18—to the top of these buff, shaly limestones—No. II—as 
ranging from 182 to 193 feet; while in our section of the Chase 
formation the thickness of the same beds is given as 176 feet. 
Meek and Hayden considered that the base of the Permian could 
t Proc. Acad. Sci. Phil., Vol. XI., p. 17. 
