Forest physiography; physiography of the United States and principles of soils in relation to forestry . the second set, Big and Mahanoy,Coal and Lock, and Stony and Sharp mountains. Another exampleis in the Buffalo or Seven Mountains (Center and Clinton counties,Pennsylvania), where a group of narrow folds, steeply pitching, hasgiven a series of short zigzag ridges with 7 loops to the northeast and7 to the southwest.^ The student who will keep these groups of facts before him will beable to understand practically all the problems that the Appalachianridges afford. A great variety of relief fe
Forest physiography; physiography of the United States and principles of soils in relation to forestry . the second set, Big and Mahanoy,Coal and Lock, and Stony and Sharp mountains. Another exampleis in the Buffalo or Seven Mountains (Center and Clinton counties,Pennsylvania), where a group of narrow folds, steeply pitching, hasgiven a series of short zigzag ridges with 7 loops to the northeast and7 to the southwest.^ The student who will keep these groups of facts before him will beable to understand practically all the problems that the Appalachianridges afford. A great variety of relief features can be assigned atonce to their proper categories and order maintained in the examina-tion of a group of data that at first sight may seem very complex. Theyfurnish the key to the solid geometry of the region, for it is solid geome-try, or a conception of three space dimensions, that is necessary in under-standing the zigzag ridges of Pennsylvania. 1 W. S. Tower, Regional and Economic Geography of Pennsylvania (Physiography), Soc. Phil., vol. 4, 1906, p. 14. 674 FOREST PHYSIOGRAPHY. (/ //////^//P//i/ Fig. 269. — The half-cigar-shaped mountains developed on the hard rocks and the arches formed by thebeds of an anticline. (Willis, U. S. Geol. Surv.)
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectforestsandforestry
