LOBECK, NEW YORE CITY, A PHYSIOGRAPHIC CENTER 



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by the mature dissection of the Catskill Mountains and of the western 

 Pennsylvania Plateau region where extreme ruggedness prevails. 



The economic dependency of people upon the features of a dissected 

 coastal plain, the contrast between the different belts, the routes of travel, 

 the position of towns, the controlling influence of the fall line, the loca- 

 tion of towns, railroads, and roads upon the surface of a youthful plain, 

 but in the valleys of a maturely dissected one, the occurrence of the ex- 

 tensive bituminous coal beds in the Allegheny Plateau region, the advan- 

 tageous methods of mining there compared with those in the folded 



ALLEGHENY 



Fig. 13. — The cuestas and lowlands of western New York 



anthracite region, these are only some of the topics that may be taken up 

 here with profit. 



Block Mountains. — The subject of block mountains offers opportunity 

 to mention some isolated examples like Snake Mountain in Vermont near 

 Lake Champlain and others in that general region. A related topic is 

 fault-line scarps illustrated by the really excellent example bounding the 

 New Jersey Highlands on the east and extending northward into New 

 York State, and again the abrupt margins of the Connecticut Lowland 

 separating it from the upland on either side (Fig. 1.8). Downfaulted 

 grabens or more truly basins resulting from the erosion of downdropped 

 less resistant rocks are represented by the Boston and Narragansett 

 Basins, the long Connecticut River lowland, and the Pomperaug or 

 Southbury Valley in western Connecticut. Rectangular drainage systems 



