556 DEAN E. WINCHESTER 
wind action. The cross-bedding here described could hardly have 
been produced in deposits laid down im a large lake, and it requires 
a vivid imagination to assign it to wind action. Eolian deposits 
usually exhibit rather minute cross-lamination. On the other hand 
it is not unreasonable to assign this character of deposits to the 
action of shifting streams, and in that respect the author is inclined 
to agree with Hatcher’ that at least part of the White River forma- 
tion was accumulated as flood-plain deposits along shifting streams. 
Darton and others, in southern South Dakota, have been able to 
trace former river courses along which sandstone phases of the 
White River formation were deposited, but in the northwestern 
part of the state the formation occupies only small isolated buttes 
and it is impossible to trace the old drainage channels along which 
these remarkable examples of cross-bedding occur, so that definite 
data along this line cannot be obtained. 
«J. B. Hatcher, ‘“‘The Origin of the Oligocene and Miocene Deposits of the Great 
Plains,” Am. Philos. Soc., Proc., XLI (1902), 113-31. 
