ABANDONED PLEISTOCENE RIVER CHANNEL. 65 



of drainage that developed after the ice melted away. This 

 would make it originate in the closing stages of the Pleistocene 

 period. From the fact that the present Flat Rock has cut its 

 channel in limestone about sixty feet at St. Paul below the bot- 

 tom of the old channel, it would appear that it had been essen- 

 tially abandoned a considerable time ago. Why the Flat Rock 

 abandoned it at Moscow, and again south of St. Omer P.O., after it 

 had reunited with it, I am not prepared to say. Nor can I say 

 that it may not possibly have been a subglacial channel that was 

 abandoned as soon as the ice melted away and left its waters 

 free to follow the lowest depression of the surface. 



The existence of the old channel north of the Little Flat 

 Rock creek was first pointed out, so far as I know, by Dr. Frank 

 Howard, of St. Paul, Indiana, who also assisted the writer in 

 tracing out the channel for the purpose of preparing the map. 



Charles S. Beachler. 



