Technical Publication Volume 3

Technical Publication Volume 3

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 edition. Excerpt: ...once more the situation that confronted as indeed it still confronts vegetation. You recall that as to New York we are dealing with a glaciated terrain. This glaciation effect is expressed in areas of bare, polished rock on the one hand and basins occupied by lakes on the other; in deposits of coarse boulders--particularly glacial moraines--in some quarters and in delta sand plains in others; in former valleys and streamways blocked by glacial filling; in accumulation of glacial till laid down upon hills and valleys; in sand beds of weathered rock covering the granite base over much of the Adirondacks; in mounds and ridges of till--the drumlins, kames, etc.; in well drained deposits of fairly constant moisture content, or too well drained and therefore periodically deficient in moisture (sand, and gravel beds) or in lowlands habitually flooded or with the water table at or near the surface. Of course factors of weathering, erosion and deposition are at work on this terrain tending in the long run to level down and even up but, meanwhile, vegetation is at work, and we not only can see at present how it works and what results it produces but by reviewing the brief period of human history we can gain an idea as to how far vegetation had gone in its general development over the State and the total results accomplished in modifying the character of its surface. Thus we recall that New York was found to be a great forest region; that a vast blanket of humus material had been spread over the land, hilltop as well as valley; that upon bare rock, great boulders (See Fig. 22) as well as broad rock surfaces, a matrix of organically rich soil had been built up so that forest trees grew upon it; that kettle holes had been filled with more

Product details

  • Paperback | 56 pages
  • 189 x 246 x 3mm | 118g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236638336
  • 9781236638335