Report of the Board of Regents Volume 54

Report of the Board of Regents Volume 54

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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. 1901 edition. Excerpt: ...the petrified logs do not occur in the same abundance throughout. They are massed or collected together in groups or heaps at certain points, and may be altogether absent at others. From their great abundance in the three areas above described, which may be called the upper, lower, and middle forests, respectively, but in all of which they are out of place and lie several hundred feet below their proper position, it must be inferred that the stratum which holds them was especially rich, and the trunks must have lain in heaps upon one another. This bed may have been considerably thicker in these areas than it is farther out on the margins, where it is now found in place. Only at two points within the general petrified forest area did I find remnants of this bed which had not been broken down and disintegrated. One of these is at the extreme northern end, half a mile northeast of the upper forest. Here there is a small mesa, which lies at an elevation of nearly 5,700 feet, or about 400 feet above the valley which contains the upper forest. It is isolated and its nearly flat top, which is approximately circular, is about half a mile in diameter. The coarse conglomeratic sandstone stratum, 20 to 30 feet in thickness, occupies the summit of this mesa and is often hardened into rock, but in all essential respects it is identical with that of the elongated mesa on the southwest side of the area above described. The petrified wood is less abundant here, but sufficiently common, and is embedded in and often projects from the sandstone ledges. TJie jYatural Bridge.--Besides the fact that this bed lies wholly within the petrified forest area, there is another important circumstance which serves to give it special prominence. One of the most...
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Product details

  • Paperback | 326 pages
  • 189 x 246 x 17mm | 585g
  • United States
  • English
  • black & white illustrations
  • 123694724X
  • 9781236947246