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" Superior, seem to lie in the great amount of amygdaloidai trap present among the latter, and of white quartz rock or sandstone among the former. But on the Canadian side of Lake Superior, there are some considerable areas, in which important masses of... "
Report on the North Shore of Lake Huron - Halaman 20
oleh Geological Survey of Canada, Sir William Edmond Logan - 1849 - 51 halaman
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Bulletin of the Geological Society of America, Volume 2

Geological Society of America - 1891 - 774 halaman
...amygdaloid, while white sandstones are present in others, as on the south side of Thunder bay, though not rn the same state of vitrification as those of Huron....there are such strong points of resemblance in the interstratiflcation of igneous rocks and the general mineralized condition of the whole as to render...
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Bulletin of the Geological Society of America, Volume 2

Geological Society of America - 1891 - 742 halaman
...amygdaloid, while white sandstones are present in others, as on the south side of Thunder buy, thuugh not in the same state of vitrification as those of Huron. But notwithstanding tlie-se differences, there are such strong points of resemblance in the interstratiflcation of igneous...
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The American Journal of Science and Arts

1852 - 960 halaman
...sandstone among the former. But on the Canadian side of Lake Superior there are considerable areas without amygdaloid, while white sandstones are present...south side of Thunder Bay, though not in the same vast amount, or the same state of vitrification as those of Huron. But notwithstanding these differences,...
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