File:Forest physiography; physiography of the United States and principles of soils in relation to forestry (1911) (14796731493).jpg

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Identifier: forestphysiograp01bowm (find matches)
Title: Forest physiography; physiography of the United States and principles of soils in relation to forestry
Year: 1911 (1910s)
Authors: Bowman, Isaiah, 1878-1950
Subjects: Physical geography Forests and forestry Soils
Publisher: New York, J. Wiley & sons (etc., etc.)
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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cipitous slopeswere rare and occurred under special conditions, as on the southeasternborder of the Alps Mountains of Colorado. Shallow valley heads led 1 F. V. Hayden, U. S. Geol. and Geog. Surv. of Col. and Adj. Terr., 1873, pp. 86-87. 2 Idem, pp. 88-89. 3 Spurr and Garey, Geology of the Georgetown Quadrangle, Prof. Paper U. S. Geol. Surv.No 63, 1908, pp. 31-36. N. M. Fenneman some time ago called attention to the fact thatthese features appear to indicate an imperfectly base-leveled surface that has been trenchedby streams invigorated by recent uplift: Geology of the Boulder District, Col., Bull. U. S.Geol. Surv. No. 265, 1905. 366 FOREST PHYSIOGRAPHY down gently from the dome-shaped mountains of the old upland andjoined wide gentle valleys that were broad and basin-like. All thesemembers of the ancient stream systems had normal profiles and noreversed slopes existed; consequently lakes did not then exist. -Althoughboth normal and glacial erosion have modified this old upland, rem-
Text Appearing After Image:
PRESENT TOPOGRAPHY. Contour iutKi-val 500 feet11106 THE OLD MOUNTAINOUS UPLAND RESTORED 10 1 2 3 4 5 miles Contour iutei-val 300 feecIJOC Fig. 123.—Old mountainous upland of the Georgetown district, Colorado, and present topography.(Spurr and Garey, U. S. Geol. Surv.) nants of it may still be seen and such remnants bear residual elevationsand in many places are covered by deep soil, conditions that wereprobably general over the larger portion of the area before uplift andglaciation took place, so that rock exposures were comparatively un-common except on the steepest slopes.^ 1 Spurr and Garey, Geology of the Georgetown Quadrangle, Prof. Paper U. S. Geol. Surv.No. 63, igo8, p. 52. ROCKY MOUNTAINS. Ill 367 The mountainous upland of the Colorado Range, formed in lateTertiary time, was then uplifted and tilted eastward so that valley carv-ing was begun. Canyons of considerable size were opened up beforethe glacial period and these the streams are still enlarging. ClearCreek is in place

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  • bookid:forestphysiograp01bowm
  • bookyear:1911
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:Bowman__Isaiah__1878_1950
  • booksubject:Physical_geography
  • booksubject:Forests_and_forestry
  • booksubject:Soils
  • bookpublisher:New_York__J__Wiley___sons
  • bookpublisher:__etc___etc__
  • bookcontributor:The_Library_of_Congress
  • booksponsor:The_Library_of_Congress
  • bookleafnumber:403
  • bookcollection:library_of_congress
  • bookcollection:biodiversity
  • bookcollection:fedlink
  • BHL Collection
  • BHL Consortium
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29 July 2014
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