THE ONONDAGA SEA IN THE ALLEGHENY REGION 103 



states of Maryland and Virginia near the present axis of the Blue 

 Ridge Mountains. From southwestern Virginia this shoreline 

 appears to have trended westerly not far from the Kentucky- 

 Tennessee line as far as the valley of the Tennessee River where 

 it resumed its southerly trend. This revision of the shorelines of 

 the Onondaga sea gives, instead of the Cincinnati peninsula of 

 Schuchert's map, a Cincinnati island. This, and probably other 

 smaller islands, interrupted the continuity of the Onondaga sea, 

 which, in the region of the Ohio valley, reached a maximum width 

 of about 500 miles from northwest to southeast. 



