PHYSICAL GEOGRAPHY OF THE PLEISTOCENE 599 
records of oscillations of level, during the period; but it seems clear 
that different parts of the same continent have suffered minor or even 
considerable deformations, independently of others. If it were 
established that opposite sides of an ocean basin were less independent 
in this respect—a doctrine for which much might be said—the 
movements on opposite sides of an ocean basin might be a hopeful 
line of research; but it cannot, at the present time, be said to have led 
to important conclusions. 
It would appear that only through a combination of stratigraphic, 
climatic, paleontologic, and orogenic studies, carried out in greater 
detail than they have yet been, can important results in the correla- 
tion of Quaternary formations be reached, between widely separated 
areas. 
