388 



ORTMANN— THE ALLEGHENIAN DIVIDE. 



[April 18, 



EXPLANATION OF PLATE XII. 



Map of the Allegheny System of Virginia, West Virginia, Maryland 



and Pennsylvania. 



The chief Physiographical Divisions are : 



AP: Allegheny Plateau; AM: Allegheny Mountains; AV : Allegheny 

 valley; PP: Piedmont Plateau; CP: Coastal Plain. They are marked off by 

 heavy dotted lines. From the upper Clinch River to Covington, on Jackson 

 River, runs another dotted line, which indicates the chief fault of this region, 

 discussed in chapter 5, p. 345. The line of heavy dashes represents the 

 divide between the Interior Basin drainage in the West, and that of the 

 Atlantic Slope (including the St. Lawrence) in the East and North. 



The following abbreviations for rivers and creeks have been used : 



Upper Ohio and Allegheny drainage 

 All = Allegheny River. 

 Bv= Beaver River. 

 Clar = Clarion River. 

 Con = Conemaugh River. 



Cr = Crooked Creek. 



Fr = French Creek. 



Kis= Kiskiminetas River. 



Loy — Loyalhanna River. 



Mah = Mahoning Creek. 

 Po = Potato Creek. 

 Qu = Quemahoning Creek. 

 RB = Red Bank Creek. 



■Monongahela drainage. 

 Bl = Blackwater River. 

 Bu = Buckhannon River. 

 DF — Dry Fork. 



SF = Shavers Fork. 



Tyg = Tygart Valley River. 



WF = West Fork River. 



Tributaries of Ohio in West Virginia and Kentucky: 



F = Fish Creek. L. Fk = Levisa Fork of Big Sandy 



River. 

 Fg = Fishing Creek. L. Kan = Little Kanawha River. 



Hg — Hughes River. M. J. = Middle Island Creek. 



Delaware drainage. 

 Leh = ~Lçhigh River. 



Liz = Lizard Creek. 



P — Princess Creek. 



Susquehanna drainage: 

 C. C. = Cush Cushion Creek. 



Ch = Chest Creek. 

 C7= Clearfield Creek. 

 Coned = Conedoguinet Creek. 

 Conew = Conewago Creek. 



N.B. = North Branch of Susque- 

 hanna. 



Si= Sinnemahoning Creek. 



Sw = Swatara Creek. 



Ti = Tioga Creek. 



W. B. = West Branch of Susque- 

 hanna. 



