Publication Volume 6, V. 1

Publication Volume 6, V. 1

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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. 1911 edition. Excerpt: ...brecciated with chloritic amygdules Trap From 25 N. in 23rd level to 103 S. (52) 34. 1 (42) (593) Amygdaloid (20) from 103 to 153 S. of 23rd level Trap (21) from 153-205 S. in 23rd level About here should be the horizon of the Osceola amygdaloid, above or below Belt 33. 35. Ophite. (141 say) Amygdaloid From 205-215 S. in 23rd level (5) Trap Sp. 16750, 16751 (63)+(35?)=98+? (734) fP To the caved-in end of the 23rd level South, 360'+ at which point the rock is still a well-marked ophite, Sp. 16750, and the mottling is 2 or 3 mm. across, so that the belt must be close to 100 feet thick, for this grain if below the center would be perhaps 35' from the bottom. Now the top of the northern-most amygdaloid in the 31st level at 1215, is by scaling at a dip of 24 just 100 feet below the top of this Belt 35. Above it to 1375 is trap. Ss. 16682 and 16681. Sp. 16681 is fine grained massive ophite. Sp. 16682 is coarser than Sp. 16750, the mottling being estimated as 4 mm. across by the eye. This is about what might be expected over 40 feet above the bottom of the flow, and points to a flow over.80 feet thick. The Kearsarge conglomerate directly below dips 2048'. The distance between the N. end of the 31st level and the S. end of the 23rd being 1800 feet more or less, a variation of a degree in the dip assumed will mean about 30 feet in the thickness of this belt. So, for instance, if we prolong the lower beds up straight we get a thickness of 220 feet as a maximum, and if we prolong the lower beds down we get 30 feet as a minimum. In such a case the grain indications are of much value. A thickness of 141 feet which we choose means a mean dip of slightly less than 23 and is probably nearer the truth for this bed at this depth. We take 141 feet, in order to make...show more

Product details

  • Paperback | 192 pages
  • 189 x 246 x 10mm | 354g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236622367
  • 9781236622365