CLARK: TACONIC REVOLUTIOM. 163 
ferred to the Taconic Revolution has been conclusively shown 
to be the result of either mid-Devonian or Appalachian moun- 
tain-building. 
After a careful survey of the literature on this problem the 
writer has come to the conclusion that the only orogenic move- 
ments at the close of the Ordovician of which we have any record 
were localized in eastern and southeastern New York State, and 
that beyond this region there is no evidence of the Taconic 
Revolution. It is suggested that much of the deformation 
ascribed to the Taconic Revolution may have been due to the 
disturbance which characterized the Devonian in this area. 
