Forest physiography; physiography of the United States and principles of soils in relation to forestry . upon the debris slopes, while the limestonesand schist areas are covered by the big-leaf pine, which forms grovesalternating with open parks.^ Ozark Province The approximate limits of the Ozark region are the Missouri andOsage rivers on the north, the Arkansas on the south, the Neosho onthe west, and the Black River on the east; the Shawnee Hills of southern 1 Weed and Pirsson, Geology of the Little Rocky Mountains, Jour. Geol., vol. 4, 1896,pp. 399-428. 2 Idem, p. 410. 452 FOREST PHYSIOGRA
Forest physiography; physiography of the United States and principles of soils in relation to forestry . upon the debris slopes, while the limestonesand schist areas are covered by the big-leaf pine, which forms grovesalternating with open parks.^ Ozark Province The approximate limits of the Ozark region are the Missouri andOsage rivers on the north, the Arkansas on the south, the Neosho onthe west, and the Black River on the east; the Shawnee Hills of southern 1 Weed and Pirsson, Geology of the Little Rocky Mountains, Jour. Geol., vol. 4, 1896,pp. 399-428. 2 Idem, p. 410. 452 FOREST PHYSIOGRAPHY Illinois, a continuation of the Ozark plateau, extend eastward to Shaw-neetown on the Ohio River. The Ozark region may be described as a broad, relatively flat-toppeddome somewhat extensively dissected and consisting of three sub-divisions, the Salem Platform, the Springfield Structural Plain, and theBoston Mountains. The Springfield Plain inclines at a low angletoward the west in Missouri and toward the southwest in Arkansas, aslope which corresponds with the dip of the underlying formation. It. Fig. 169. — Subdivisions of the Ozark region and relations to surrounding provinces.(Taff, U. S. Geol. Surv.) is deeply dissected by the large streams which flow through it innarrow valleys; the interfluves are large tracts of broad flat structuralsurfaces from which younger formations have been eroded. TheBoston Mountains are capped by thin layers of sandstone and shale,the more resistant sandstone governing the physical features of themountains. The rocks dip in the main to the south at an angleslightly greater than the general southward slope of the surface. Fromhilltops on the Springfield Plain the Boston Mountains appear as abold, even escarpment with a level crest, but on closer examination theescarpment is seen to have many finger-Hke extensions to the north PLATEAUS AND RANGES OF THE PLAINS COUNTRY 453 in the form of ridges and foothills. Toward the west the BostonMountai
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectforestsandforestry
