MARCOU—GEOL. OF KANSAS. 611 
leaves found in this bed belong to the Tertiary, and, still 
more, indicate the Lower Miocene or Oligocene. 
As to superposition, Messrs. Meek and Hayden have not 
given a single section showing the superposition of Cretaceous 
beds above this of the fossil leaves. Slopes and differences 
of level have never been recognized as indicating superposi- 
tion with certainty. 
the fresh-water Molasse of Switzerland—that is to say, Mid- 
le Miocene, : 
I will say but a word more upon the last memoir of hop ca 
Meck ana Hayden, entitled, “Geological Explorations 7 rar 
sas Territory.” in’ the Proceedings of the . ead, of : a ving 
Sciences of Philadelphia, J: an. 1859, In this eK. t ts Wak. 
ologists give a general section of the rocks of the grep ate 
ley (pp. 16-18), upon which I desire to make the "aidcorte 
observation :—It seems to me, that there must be 2. and all 
ince of stratification between the numbers 30 and 31; rm 
the numbers from 31 to 40, instead of being ws = pe a be- 
fasures, are, for me, of the Upper Mountain Limes 30 and 
low the true Coal Measures. Between the en talse 
31, there is either a discordance of stratification, or @ 
concordanee, 
