554 L. Lesquereux—Lignitic formations of the Rocky Mountains. 
to the assertion that the fossil plants have little bearing on the 
question, it is clear, therefore, that it is from the evidence fur- 
nished by vegetable paleontology that the question has to be 
decided. 
I have been, however, careful to consider the data furnished 
by animal paleontology in regard to the age of the strata. I 
have quoted Prof. Meek’s passage of a letter where his opinion 
is recorded rather in favor than in contradiction of mine. 
could have remarked too that he has even found at Black Butte 
guishable from modern species, ete. 
s conclusions, in his Review of the Vertebrata - 
Switzerland, and a comparison with contemporaneous repos- 
remains of Cretaceous animals which all disappear to the south. On this 
en ie eous fauna has persi a longer time toward po 
north. The same observation, preci could be ated on co 
Lignitic of Colorado with that of Wyomige, Be — 
