Bulletin - United States Geological Survey Volume 284

Bulletin - United States Geological Survey Volume 284

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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. 1906 edition. Excerpt: ...River, about 3 miles above the mouth of Chickaloon Creek. (See fig. 5.) They have also been reported from Boulder, Hicks, and Caribou creeks, from a creek on the south side of the Matanuska, i) miles above Coal Creek, and from Little Sushitna River. The extent of the area underlain by coal is not very definitely known. There are at least 70 square miles of coal in the valley of the Matanuska and its tributaries from Tsadaka Creek to Hicks Creek, inclusive. This is a conservative estimate, based on outcrops actually known to the writer. It is possible that there is a larger area than this, but it seems certain from present knowledge that the coal area in the region indicated above can not in any case exceed 300 square miles, except by further extensions of this field or neighboring fields outside the region visited by the writer, which might increase the area to limits which we have no means at present of knowing. 1'OSITION AND SECTIONS OF THE COAL. There are at least two distinct kinds of coal in this region, occurring at two widely separated geologic horizons. One is the anthracite coal, which-is Mesozoic, and the other includes various grades of bituminous coal, which are of Tertiary age. ANTHRACITE. The Mesozoic coal, as stated above, is apparently all anthracite. It was seen by the writer only along the flanks of the Talkeetna Mountains, between Boulder and Hicks creeks. This coal has the ordinary physical characteristics of most good coal of this kind. It is heavy, firm, hard, and not much fractured, even at the surface, and has a high luster. Pyrite was not noticed. The seams are not much broken by small partingsof shaleand bone. Two sections were measured. On the south bank of Purinton Creek, at an elevation of 3,410 feet, an...
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Product details

  • Paperback | 108 pages
  • 189 x 246 x 6mm | 209g
  • English
  • Illustrations, black and white
  • 123695923X
  • 9781236959232