88 LABRADOR 
forces which set the earth’s crust writhing so long ago, and 
so built one of earth’s earliest mountain-systems. 
Rather, then, to raise the question than to declare an 
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Rie. 43: 
Sketch map showing mountain trends in eastern North America. 
answer to it, the writer has prepared the diagram of Figure 13, 
embodying a tentative conclusion, the result of ,observa- 
tions at some twenty-five localities on ‘‘the Labrador.” 
