388 ORTMANN— THE ALLEGHENIAN DIVIDE. [April i8, 



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 ofif 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: 

 .<4// = Allegheny River. Cr = Crooked Creek. 



5z^ = Beaver River. Fr = French Creek. 



C/or= Clarion River. ifij = Kiskiminetas River. 



Com = Conemaugh River. L03; = Loyalhanna River. 



Ma/t = Mahoning Creek. 

 Po = Potato Creek. 

 Qu = Quemahoning Creek. 

 RB = Red Bank Creek. 



Monongahela drainage: 



Bl = Blackwater River. SF = Shavers Fork. 



Bu = Buckhannon River. Tyg = Tygart Valley River. 



DF = Dry Fork. IVF = West Fork River. 



Tributaries of Ohio in West Virginia and Kentucky: 

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



River. 

 F5r = Fishing Creek. L. A'a;i = Little Kanawha River. 



//£?=: Hughes River. M. /. = Middle Island Creek. 



Delaware drainage: 

 Le/i = Lehigh River. L/^ = Lizard Creek. P = Princess Creek. 



Susquehanna drainage: 



C. C. = Cush Cushion Creek. N.B. = North Branch of Susque- 



hanna. 



Ch = Chest Creek. 5"t = Sinnemahoning Creek. 



C/= Clearfield Creek. 5"w = Swatara Creek. 



Con^c? = Conedoguinet Creek. 7z = Tioga Creek. 



Con^w = Conewago Creek. JV. B. = West Branch of Susque- 



hanna. 



