34 BULLETIN OF THE LABORATORIES 



volume of the water flowed over the col at P and developed the Brush 

 creek gorge. As climatic conditions prevailed and the ice began to 

 recede from the heads of these valleys the volume of water which 

 filled the outlet streams at E and P remained large and excavated 

 large valleys in the ground moraine thus exposed and cut deep and 

 wide gorges in the rocks at E. and P. As soon however as recession 

 had proceeded as far as Paint creek this new channel was taken by 

 the glacial waters and the water in Brush creek was suddenly re- 

 duced from a considerable torrent to a small stream fed only by 

 meteoric waters. As the volume of the water was reduced suddenly 

 there was no opportunity for the development of terraces in Baker's 

 Fork of Brush creek. Subsequent erosion has resulted in the partial 

 filling of these gorges and the present state of movement is now un 

 certain. 



If the above conclusions are warranted the Beech Flats must then 

 be considered as a portion of the great level topped ground moraine so 

 extensive within the limits of the ice movement in the portions of the 

 State to the north and west of the Flats. 



