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Correlation Papers; Archean and Algonkian
Correlation Papers Archean and Algonkian Author:Charles Richard Van Hise General Books publication date: 2009 Original publication date: 1892 Original Publisher: Govt. Print. Off. Subjects: Geology, Stratigraphic Geology Stratigraphic correlation Science / Earth Sciences / General Science / Earth Sciences / Geology Notes: This is a black and white OCR reprint of the original. It has no illustrations a... more »nd there may be typos or missing text. When you buy the General Books edition of this book you get free trial access to Million-Books.com where you can select from more than a million books for free. Excerpt: SECTION V. WORK OF THE MINNESOTA GEOLOGISTS AND ASSOCIATES. EAMES,149 in 1866, mentions different crystalline rocks as occurring at many points in northeastern Minnesota. EAMES, l60 in 1866, describes in Minnesota various granitic, igneous, and metamorphic rocks. The most prevalent rocks found in the northern part of the state are granite, porphyry, hornblende slates, siliceous slates, trap, greenstone, talcose slate, primitive schistose rock, gneiss, and Potsdam sandstone. The rocks of the Upper Mississippi river are described. At Pokegama falls the rock is a quartzite belonging to the Potsdam. There is also found along the river jasperoid rock with iron ore and argillaceous slate. Iu Stearns county are numerous exposures of granite. The varieties of rocks in the Vermilion lake district are found to be very numerous.. Hall (james), ll in 1869, finds in the vicinity of New Ulm, oil the Big Cottonwood river and ou the Little Cottonwood, extensive exposures of quartzite. At New Ulm the rock is shown to be a metamorphosed quartz rock or conglomerate. This rock is succeeded below by compact quartz rock, with beds of syenite, which graduate still lower into purple or reddish quartz rock in distinct layers, alternating with shaly seams. The quartzite of this region has a thickness of not less than 1,500 feet. At Redwood falls are found gneiss and granitic rocks of Laurentian age. The quartzites are regarded as of the age of the H...« less