72 XEW YORK STATE ML'SEL-IM 



in Arkona time. Then the readvance of the ice (obHque to the 

 valle}'' slope) would override and destroy a stretch of the Arkona 

 beach. (If the ice reached the Maumee limit the features would 

 simulate those in "A". The full-hight Whittlesey would extend 

 eastward only up to the advanced moraine, or only as far as the 

 undestroyed Arkona. In other words the Arkona and the Whittle- 

 sey would have the same eastward limitation. Both the Arkona 

 and the Whittlesey would terminate against a moraine with full 

 force instead of fading out. (Any recession of the ice during the 

 Whittlesey episode would cause some fading of the shore line.) 



The ice border drainage in the eastward stretch from the ter- 

 mination of the Maumee shore to the Whittlesey moraine would 

 reach down to the Arkona level, except right at the moraine, 

 where it would reach only to the Whittlesey level. Beyond the 

 moraine, eastward, the glacial drainage would reach down to 

 the Warren level. (There would be no glacial drainage, only land 

 stream drainage, into the Whittlesey waters, except at the read- 

 vance d moraine.) 



C The ice front continuously receding. The Maumee bars 

 would fade out. The Arkona bars would extend farther eastward 

 and also fade out, but would be modified by the subsequent sub- 

 mergence. The Whittlesey shore line would reach still farther 

 east and fade out. 



The ice border drainage in the Maumee territory would reach 

 down only to the Maumee level. Eastward of the Maumee limit 

 the glacial drainage would reach down to the Arkona level as far 

 east as the Arkona shore extended. Farther eastward this drain- 

 age would reach down only to the Whittlesey level, as far as that 

 shore extends, beyond which the drainage would reach down to 

 the Warren level. This is expressed in the following diagram, 

 in which heavy lines suggest the limits of glacial drainage. 



I Maumee 

 ^ 3 Whittlesey ^ 



^ 2 Arkona -^ 



g I 



^ 4 Warren 



The following important facts bearing on the three postulates 

 may be restated. 



I Obliquity of ice front. The New York edge of the Brian ice 

 lobe was oblique to the land slope, in consequence of which the 



