Report of the State Board of Geological Survey Volume 7

Report of the State Board of Geological Survey Volume 7

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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. 1906 edition. Excerpt: ... Paul of West Bay City. In the center of section 10, Bangor township, he went through beds of sand and muck for a depth of 30 feet, which contained a deposit of logs and shells at the bottom. This was underlain by 80 feet of clay. Another similar deposit was found at the Corbin school in West Bay City, at a depth of 30 feet, and underlain by 50 feet of clay. Unfortunately we have not been able to obtain any of the specimens of shells in either locality. In the S. E. of section 24 of Kawkawlin township, the maximum amount of sand deposited over the clay amounts to 25 feet. I have taken these beds as late glacial deposits formed during the lacustrine period of the later Quaternary. Additional information concerning the thickness of the superficial sand beds will be found in the section dealing with the distribution and structure of the surface deposits, toward the end of this chapter. 3. Moraines; the Lake History. In the discussion in the preceding portion of this chapter no mention was made of the agent by means of which the drift was accumulated. During a period geologically recent a great glacier descended from eastern Canada carrying with it a great burden of material, which was in part deposited as a ground moraine along and underneath the advancing ice; in part as moraines of recession in front of the retreating ice mass. Interglacial deposits indicating at least four stages of advance and retreat have been found in the region south and west of Michigan. In this state, however, the ice action being relatively more pronounced, and nearer the center of ice origin, the earliest stages have probably been obliterated, at least in part. During the retreat of the ice mass in Michigan, the ice formed a tri-lobate structure which has been designated, more

Product details

  • Paperback | 224 pages
  • 189 x 246 x 12mm | 408g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236519574
  • 9781236519573