DRAINAGE SYSTEMS AND THE GLACIAL PERIOD. 521 



Fig. 56. — Map illustrating a stage in the recession of the ice in Ohio. For a section of 

 the deposit in the bed of this lakelet, see page 200. The gravel deposits formed at 

 this stage along the outlet into the Tuscarawas River are very clearly marked (Clay- 

 pole). (Transactions of the Edinburgh Geological Societv. 



