. The Crystal Falls iron-bearing district of Michigan. Iron ores; Geology; Geology, Stratigraphic; Geology, Stratigraphic. PKEVIOUS WORK. 17 1S73), a {jortion of wliicli is reproduced iu ti<i-. 3, Brooks lias failed to outline the granitic areas kuowu to the previous explorers. Except iu a. Scale ormiles IS =1 Fig. 3.âEnlarged reproduction of a portion of a map of the Lake Superior laud district, by Foster and Whitney. G;=graDite; T^trappean rocks; cT^ii'on; ;^|P| = beds of marble. Metamorphic formation. Azoic system. Igneo 18 formation. (Associated with the Azoic.) Trappean rocks. Granite.

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. The Crystal Falls iron-bearing district of Michigan. Iron ores; Geology; Geology, Stratigraphic; Geology, Stratigraphic. PKEVIOUS WORK. 17 1S73), a {jortion of wliicli is reproduced iu ti<i-. 3, Brooks lias failed to outline the granitic areas kuowu to the previous explorers. Except iu a. Scale ormiles IS =1 Fig. 3.âEnlarged reproduction of a portion of a map of the Lake Superior laud district, by Foster and Whitney. G;=graDite; T^trappean rocks; cT^ii'on; ;^|P| = beds of marble. Metamorphic formation. Azoic system. Igneo 18 formation. (Associated with the Azoic.) Trappean rocks. Granite. Quartz. Crystalline schists. few places, which have been left tincolored, the district is covered with the â color representing the Huroniau. MON XXXVI-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Clements, Julius Morgan, 1869-; Smyth, Henry Lloyd, 1862-; Bayley, William Shirley, 1861-1943. Washington, : Govt. Print. Off.

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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectgeology