The Marquette Iron-Bearing District of Michigan; With Atlas

The Marquette Iron-Bearing District of Michigan; With Atlas

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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. 1897 edition. Excerpt: ...the Kitchi formation is here a tuff closely resembling a true water-deposited conglomerate. Near the north-south quarter line of sec. 34, in a little valley between the quartzite on the south and the green schist on the north, a contact was found between the two formations where the unconformable relations are perfectly clear. This contact has already been described on page 295. At another locality, west of the wagon road near the west line of sec 34, the quartzite lies on the south side of the green schist as a mere skin, and here the same unconformable relations are seen as in the center of the section. In one case the plicated quartzite described (pp. 297-298) is found wrapping around the east end and the north side of a small knob of Kitchi schist. This occurrence is believed to be explained by a headland 1 The Marquette iron region, by C. Rominger: Geol. Surv. of Michigan, Vol. IV, Part I, 1878-1880, pp. 37-39. projecting somewhat diagonally from the old shore-line into the Ajibik sea, thus forming a bay, and detrital material was deposited upon three sides of the schist. When the two formations were upturned to the north and eroded, the rocks assumed their present relations. A basal conglomerate grades up quickly into a regularly bedded, southward-dipping, vitreous quartzite, which shows nearly all of the phases characteristic of the formation, including ordinary quartzite, ferruginous quartzite, veined cherty quartzite, quartz-rock, and chloritic quartzite. At one place, at the quarry just west of the Carp River, is a fine-grained conglomerate 6 or 8 inches thick, which holds very numerous fragments of bright-red jasper. These were at first thought to have been derived from the Negaunee formation of the Lower Marquette series, but more

Product details

  • Paperback | 246 pages
  • 189 x 246 x 13mm | 445g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236504798
  • 9781236504791