404. J. 8S Newberry on the Lignites and Plant-Beds, etc. 
ous flora. While it is altogether new, its varied character and 
modern aspect simply gives us a new revelation in regard to 
the vegetation of the Cretaceous world; for, while the fauna of 
that world contains Ammonites, Baculites, Inoceramus, &e., We 
are forced to call it Cretaceous. It is not impossible that the 
physical conditions of our continent may have remained so 
constant that the Cretaceous age faded gradually into the Ter- 
tiary. It is not impossible, therefore, that we may find some 
Cretaceous forms of life interlocking with those of the Tertiary 
times largely made up of the remains of all the typical Cretace- 
ous forms of life. Possibly in Colorado, beyond the reach of the 
in saying that such will probably prove to be the case; 0; # 
least, that no evidence has been yet found which disproves 1t- 
right-minded man. It is important, however, for the true Pa 
gress of science, that no conelusion should be accepted unt 
it 1s sustained by ample proof. 
