The Mining and Quarry Industry of New York State for and Volume 166

The Mining and Quarry Industry of New York State for and Volume 166

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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. 1913 edition. Excerpt: ...of the effective drift dam, and even today, in the spring of the year, a number of square miles of swamp in the lowest part of the valley are flooded. The lake was drained by cutting down the divide at Conklingville. It is interesting to note in passing that the construction of the proposed Sacandaga reservoir, by means of a dam at Conklingville, would almost exactly restore this former glacial lake. ' Many other glacial lakes are known to have been formed by ponding of water alongside the waning Mohawk ice lobe. During the melting of the ice tongue from the Hudson and Champlain valleys, many small glacial lakes are also known to have been formed in the tributary valleys because of ice dams across them. New York State fairly abounds in such extinct glacial lakes, and though comparatively few have yet been described, they are usually easily recognizable by means of the typical, flat-topped, delta deposits of crudely stratified sands, gravels and clays. Drainage changes, gorges, and waterfalls. Alon-g with its lakes, New York State is also famous for its numerous gorges and waterfalls, which are also largely due to the great Ice age. As a result of the very long preglacial erosion period, it is perfectly clear that typical, steep-sided, narrow gorges and true waterfalls must have been very uncommon, if present at all. Like lakes, such features are ephemeral because, under our conditions of climate, gorges soon (geologically) widen at the top and waterfalls disappear by retreat or by wearing away the hard rock over which they fall. Drainage changes, aside from those already described in connection with the history of lakes, are also numerous in New York. It must be remembered that, with few exceptions (for example, the basins of Lakes...show more

Product details

  • Paperback | 238 pages
  • 189 x 246 x 13mm | 431g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236929527
  • 9781236929525