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932 E. W. SHAW SORTING IN SEDIMENTARY ROCKS 



sufficient number of observations wiil bring to light diagnostic features 

 by which certain kinds of sediment can be recognized and the identifica- 

 tion of others narrowed to a few possibilities. At present the r lost prom- 

 ising line of attack is the comparative study of groups of analyses, eacli 

 group of a single deposit or a single kind of sediment. 



