CLA SSIUCA THON (OR WIP IPAILZEOLZONC IROCIES, 735 
not be lower than the top of No. 11, although it might be still 
higher and include No. 10.7 
Meek and Hayden apparently failed to notice the Marion 
flint and concretionary limestone, which probably forms a part of 
their No. 10, so it is not possible to compare closely their sec- 
tion with the upper part of the Chase formation. 
Comparison with Hay's Fort Riley section — Professor Hay has 
described a section near Fort Riley* which probably includes all 
of the rocks referred to the Chase formation. The Strong flint 
is No. 5 of Hay’s section, which he termed ‘the lower flint beds” 
or the ‘‘Wreford limestone,” 25 feet thick.3 
hie Mlorencesthintiiss Nos oVot ray Aawihichs hemcallledsethe 
upper Hint beds trom 25 to 30 feeb im thickness; and! 15 feet 
higher in his massive “ Fort Riley main ledge’—No. 11—6 feet 
thick, capped by shaly limestones from 30 to 40 feet in thickness. 
Then come 50 to 60 feet of shales, and at the top of the section 
is No. 14 which is described as composed of ‘‘impure limestones 
with some flints and numerous geodes,” 10 feet in thickness. It 
is probable that this highest bed represents the Marion flint or 
concretionary limestone, which apparently occurs in the bluff 
above the railroad cut west of Chapman. According to Profes- 
sor Hay, the thickness of the rocks from the base of the Wreford 
* Proc. Acad. Sci. Phil., Vol. XI., pp. 20, 21, where it is stated that, “If we do not 
admit the existence in this region of an intermediate group of rocks, connecting by 
slight gradations the Permian above with the Coal Measures below, and must draw a 
line somewhere, below which all is to be regarded as Carboniferous, and all above as 
Permian, we should certainly, upon palzeontological principles alone, carry this line up 
as far as the top of division No. II..... Indeed the fact that some of the Permian 
types occurring in No. 10 were first introduced in beds below this, containing many 
Carboniferous species would seem to indicate that even No. 10 may possibly have been 
deposited just before the close of a period of transition from the conditions of the Car- 
boniferous to those of the Permian epoch.’” 
About the same time Meek and Hayden stated in the American Journal of Science 
—*“We think only the Upper Permian of their section [Swallow and Hawn] really 
represents the Permian rocks as developed on the other side of the Atlantic” (Second 
series, Vol. XXVII., Jan. 1859, p. 35); while the Lower Permian of Swallow they 
called Permo-Carboniferous. 
? Eighth Bien. Rept. State Board Agri. Kansas, p. 104. 
3This horizon as exposed in the Kansas River Valley was discussed by Prosser in 
the Bull. Geol. Soc. Am., Vol VI., pp. 47, 48. 
