Forest Physiography: Physiography of the United States and Principles of Soils in Relation to ForestryWiley, 1911 - 759 Seiten |
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alluvial altitude amount anticlinal Appalachian areas basalt Basin belt broad Bull California canyons Cascade Range Cascades clay cliffs climate Coast Ranges Coastal Plain Colorado Colorado Plateaus covered Cretaceous Cumberland Plateau deposits developed dissected district drainage Driftless Area east eastern border Edwards Plateau elevation erosion extends fault feet flat flows Folio U. S. Geol forest formation geologic glacial glaciers gneiss granite growth hills humus Idem inches Lake land lava Lewis range limestone lower lowland margin Mesa miles moraines Mountains northern occur Oregon Paper U. S. Geol peaks peneplain physiographic pine plants plateau portion Prairie province rainfall region ridges River rock Rockies sand sandstone scarp schists sedimentary shales Sierra Nevada slopes soil southern spruce steep strata streams structure summit surface Surv temperature terraces Tertiary timber line topographic tracts trees tributaries U. S. Geol upland uplift valleys vegetation volcanic western
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Seite 464 - XIII. The Champlain sub-stage (marine). XII. The glacio-lacustrine sub-stage. XI. The Later Wisconsin, the sixth advance. X. The fifth interval of deglaciation (as yet unnamed). IX. The Earlier Wisconsin, the fifth invasion. VIII. The Peorian, the fourth interglacial interval. VII. The lowan, the fourth invasion. VI. The Sangamon, the third interglacial interval. V. The lllinoisan, the third invasion.
Seite 184 - The nonforested catchment area, which, during December, experienced a run-off of 40 per cent. of the rainfall, and which during the three following months had a run-off of 95 per cent. of the precipitation, experienced a run-off in April (per square mile) of less than one-third of that from the forested catchment areas, and in June the flow from the nonforested area had ceased altogether.
Seite 568 - Alders occur in more or less dwarfed conditions in favorable places well within the treeless area, and several species of willows, some of which here attain a height of 5 or 6 feet, border some of the streams as far north as Wollaston Land. These are the only trees which occur even in a dwarfed state in the Barren Grounds proper.
Seite 722 - This is vegetable matter consisting of roots and fibres, moss, etc., in various stages of decomposition, occurring as turf or bog, usually in low situations, always more or less saturated with water, and representing an advanced stage of swamp with drainage partially established." MUCK. " This type consists of black more or less thoroughly decomposed vegetable mold, from 1 to 3 feet or more in depth and occupying low, damp places, with little or no natural drainage. Muck may be considered an advanced...
Seite 146 - A preliminary paper on the geology of the Cascade Mountains in northern Washington: US Geol.
Seite 333 - Forest conditions in the Absaroka division of the Yellowstone Forest Reserve, Montana, and the Livingston and Big Timber quadrangles, by JB Leiberg.
Seite 110 - A normal duration of a temperature of 50° for less than a month fixes very well the polar limit of trees and the limits of agriculture. Near this line are found the last groups of trees in the tundras. A temperature of 50° for four months marks the limit of the oak, and also closely coincides with the limits of wheat cultivation. North of the tree limit, agriculture ceases, and man's food is to be sought very largely in the sea.
Seite 184 - December, experienced a run-off of but 5 per cent of the heavy precipitation for that month, and which during January, February, and March of the following year had a run-off of approximately...
Seite 721 - Soils of different classes that are thus related constitute a series. A complete soil series consists of material similar in many other characteristics, but grading in texture from stones and gravel on the one hand, through the sands and loams, to a heavy clay on the other.
Seite 34 - Almost any mineral may be present in clays and modify the properties somewhat. The combination of granular materials and colloids is in such proportion that, when reduced to sufficiently fine size (by crushing, sifting, washing, or other means) and properly moistened with an appropriate amount of water, plasticity is developed.