Congressional Edition Volume 5457

Congressional Edition Volume 5457

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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. 1908 edition. Excerpt: ...and Mesozoic is one of displacement, along which the overturned Triassic was shoved eastward across the truncated edges of the Robinson formation. The local disappearance of the Swearinger slate between the Hosselkus limestone and the Robinson formation is most likely due to displacement. JURASSIC. GENERAL ACCOl'NT. There are seven Jurassic formations of the Taylorsville region. The Trail formation is the oldest; then follow the Hardgrave sandstone, Thompson limestone, Mormon sandstone, Bicknell sandstone, Hinchman tuff, and Foreman formation in regular succession. With the exception of the last their surface distribution is limited to a comparatively small area about Mount Jura, and to facilitate matters it may be stated here that the whole set of beds have been overturned and that the Hardgrave sandstone apparently lies on top. In their attitude they are like the Triassic and Carboniferous, already described. The strike is northwest and the dip southwest. TRAIL FORMATION. Lithologic character.--The Trail formation includes a mass of strata composed largely of slaty shales with some interbedded sandstones and conglomerates. It is well exposed along Hosselkus Creek on the trail, hence the name. The shales are often purplish or red, but perhaps more frequently gray, with pencil structure locally developed, and contain in places numerous cherty nodules of carbonate of lime. Well-marked slaty structure is not uncommon. The sandstones are generally fine, often somewhat slaty, are thin bedded, and vary from gray to almost black. The conglomerates of slate and sandstone pebbles, sometimes 3 inches in diameter, generally contain much volcanic material. Approaching the contact with the granodiorite in many places the fine sediments become darker...show more

Product details

  • Paperback
  • 189 x 246 x 16mm | 531g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 123676899X
  • 9781236768995