Forest physiography; physiography of the United States and principles of soils in relation to forestry . ver; but their flow varies greatly in volume, being high in therainy season, when their tributaries are full, and very low in the dryseason, when their tributaries fail. Many streams, especially the streamsof medium size, flow in box-like trenches, the material of their banksstanding up in bluff-like form as about the border of the area.^ 1 For a summary description of the badlands of South Dakota, illustrated by well-selectedphotographs, see The Badland Formations of the Black Hills Region
Forest physiography; physiography of the United States and principles of soils in relation to forestry . ver; but their flow varies greatly in volume, being high in therainy season, when their tributaries are full, and very low in the dryseason, when their tributaries fail. Many streams, especially the streamsof medium size, flow in box-like trenches, the material of their banksstanding up in bluff-like form as about the border of the area.^ 1 For a summary description of the badlands of South Dakota, illustrated by well-selectedphotographs, see The Badland Formations of the Black Hills Region, C. C. OHarra, D. School of Mines No. 9, 1910. GREAT PLAINS 417 HIGH PLAINS The map, Plate IV, indicates the extent of the High Plains, the mostimportant subdivision of the Great Plains province. The interior topo-graphic and drainage features of the High Plains are typically representedin the Llano Estacado (Staked Plains) of Texas, the surface of whichappears extremely flat to the eye, though it actually slopes eastwardat the rate of 8 or 10 feet to the mile. Only gentle depressions occur. Fig. 150. — Physiographic subdivisions of and eastern New Mexico. (Hill, U. S. Geol. Surv.) here and there — the products of underground solution and of unequalwind erosion. Local storm floods tend to level these irregularities byfilling the hollows and eroding the surrounding surface.^ The High Plains strata were laid down as a series of great compoundalluvial fans or a piedmont alluvial plain at the eastern base of theRocky Mountains. The eroded bedrock floor upon which the materialswere deposited and the eroded condition of the materials themselves » R. T. Hill, Physical Geography of the Texas Region, Folio U. S. Geol. Surv. No. 3, igoo,p. 6, col. 3. 4i8 FOREST PHYSIOGRAPHY imply a succession of changes in the character of the stream action fromdegradation to aggradation and back again to degradation. Thesechanges harmonize with the conception of climatic changes of
Size: 1669px × 1497px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectforestsandforestry
