Page:The Journal of geology (IA journalofgeology21894univers).pdf/79

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 bottom of the old channel, it would appear that it had been essentially 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 existance 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.