... Contributions to the Pre-Cambrian Geology of Northern Michigan and Wisconsin: The Geology of Limestone Mountain and Sherman Hill in Houghton County, Michigan, Issue 15

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W.H. Crawford Company, State printers, 1915 - Geology - 189 pages

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Page 3 - Sherzer, Ypsilanti. Botanists.—Prof. EA Bessey, East Lansing; Prof. FC Newcombe, Ann Arbor. Zoologists.—Prof. WB Barrows, East Lansing; Prof. J. Reighard, Ann Arbor; Dr. Bryant Walker, Detroit. LETTER OF TRANSMITTAL. To the Honorable, The Board of Geological and Biological Survey of the State of Michigan: Gov. Woodbridge N. Ferris. Hon. Fred L. Keeler. Hon. Wm. J. McKone. Gentlemen:—I have the honor to transmit herewith
Page 163 - River, which follows the northeast side of the trough to Gwinn and then turns south across the sand plains. On the plains the water table is within a few feet of the surface and the ore bodies are deeply buried under water-saturated sand and gravel, a condition which is a serious menace to mining operations.
Page 21 - Geology of the Lake Superior region, by CR Van Hise and CK Leith,
Page 21 - series of Michigan and Wisconsin, by RD Irving and CR Van Hise,
Page 190 - In the lower ledges, casts of Bivalves and of Gasteropods are numerous, but not well enough preserved for determination; the same is the case with fragments of Orthoceras and Cyrtoceras. I have identified, Orthis occidentalis. Orthis testudinaria. Orthis similar to pectinella. Orthis lynx. Rhynchonella increbescens.
Page 122 - ranging from less than an inch to a foot or more in diameter,
Page 163 - Outliers of flat-lying Paleozoic (Cambrian or Ordovician) sandstone and limestone occur throughout this area. The pre-Cambrian beds are remnants of formations, originally much more extensive, which have escaped erosion by downfolding or depression in the Archean basement. The synclinorium is constricted to not more than three-fourths of a mile in width in the vicinity of the
Page 190 - and exhibiting an internal septum like the ventral valve of a Pentamerus. A specimen of this kind may possibly have induced Jackson to mistake it for Pentamerus oblongus.
Page 169 - not to the basal member of the Gwinn series as it actually exists in the Gwinn synclinorium. There is an arkose and arkose conglomerate in these exposures exactly similar, even to the pebbles in its associated conglomerate, to the basal member of the Gwinn series. This formation, however, is plainly
Page 167 - of quartzite, quartz slate, and siliceous, cherty, slightly dolomitic slate derived from a third sedimentary series unconformably below the Gwinn series but not present so far as known in the Gwinn synclinorium. MIDDLE HURONIAN. Gwinn Series. There are four members of the Gwinn series, viz., from the base upward,