170 CHARLES R. KEYES 



The real meaning, then, of the multitude of new names that 

 has recently made its appearance in the literature of stratigraphy, 

 is the practical adoption of more refined methods of geological 

 work, the provision of suitable means for the collection of more 

 exact geological data, and the grasping of more advanced and 

 rational conceptions regarding geological correlation and classi- 

 fication. 



Charles R. Keyes. 



