LEROY PATTON 



701 



number of these aggregations at the place described seemed to be 

 due to the fact that the flat was on the inside of a rather sharp bend 

 where the current would be slackened. 



Fig. I. — Concretionary-like aggregations of fine clay deposited on a sandy flat 

 in the bed of the North Fork of the Red River, Oklahoma, during a flood. 



From the very perfect resemblance of these clay aggregations 

 to ordinary concretions and the rather large number of them found 

 after this one flood, the writer is inclined to agree with Gardner 

 that this method of formation of concretions may be more common 

 than is ordinarily supposed. 



Figure i gives some idea of their size and distribution. 



