Geology of the Northern Adirondack Region

Geology of the Northern Adirondack Region

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 edition. Excerpt: ...Beekmantown. There is no mixing of materials lbut rather a rapid alternation of two contrasted sets of deposition conditions. Walcott has measured a thickness of 25 feet of such passage beds along the Chateaugay river and 70 feet near Whitehall. In the writer's judgment, the I latter is much nearer the-usual figure than the former. These beds are exposed at many localities along the northern border 'of the region, but seldom suitably for measurement of thickness. They seem usually of considerable bulk. Beekmantown (Galciferous) formation. Just as in the case of the Potsdam beneath, the Beekmantown formation is thickest on the northeast margin of the Adirondack region and thins out to the west and south, though the thinning is less rapid, so 'that the formation extends much beyond the limits of the Potsdam, being lacking only on the west side of the region. The type locality is at Beekmantown, Clinton co., where the formation is very fossiliferous, but where the section is quite incomplete; in fact, there is no one locality in Clinton county where anything like a complete section of the formation can be obtained. For such sections recourse must be had to the district nearer the upper end of the lake. Here the dips are steeper, and there are two localities in Shoreham Vt, where the full section is shown, and the section about Fort Ticonderoga is quite complete also. These sections have been studied in detail by Brainard and Seeley, and the results obtained there applied to other parts of the Champlain region No other work approaching thi for detail and accuracy has been done on the formation in the Champlain region. In their type section at-Shoreham they have recognized five subdivisions of the formation, as follows:2...show more

Product details

  • Paperback
  • 189 x 246 x 4mm | 136g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 123696621X
  • 9781236966216