 | | Report (issue) | | Divisions, ~. Coastal Hills, ~. Interior Upland, 4. Northern Ridges and Valleys, 5. Rivers, 7. Lakes and Swamps...Mineral Descriptions, 43. Intermediate Rocks, 44. Granophyre, 45. Anorthosite in Gabbro, 47. Contact Metamorphism...The area is hilly with a minimum elevation above sea level of 60~ feet at Lake Superior and ~~3~ feet...feet in the Misquah Hills. Much of the northern part of the county is characterized by long narrow lakes...are shown on Figure 2. Although largely a hilly region, Cook County is not mountainous despite the use |  | | Book | | and its surroundings, from the early deep-sea and volcanic episodes of the Ordovician Period, through...of Skiddaw Slate sediments . 81 8 Borrowdale Volcanic rocks (a) andesitic flow breccia, and (b) coarse...Society, so well known for his studies of the volcanic rocks of the /'strict which he summarized in two...Limited H. V. Dunnington and Associates Mobil North Sea Limited Home Oil (U.K.) Limited Robertson Research...DOWNTONIAN SILURIAN' TRIASSICs LUDLOW WENLOCK Granophyre; microgranite Diorite; dolerite; ultrabasic intrusions |
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