. The Vermilion iron-bearing district of Minnesota : with an atlas . Greenstone ^.^?? Scale 50 100 feet // Soudan formation / (iron-bearing) /. Fig. 7.—Sketch showing relations of Soudan formation and Ely greenstone on Jasper XLV—03 li 210 THE VERMILION IRON-BEARING DISTRICT. atteutiou was paid to the contact between the irou formation and the green-stone, but very careful search showed no indication of anj clastic materialbetween them. Nearly everywhere this greenstone is perfectly massive; ina few places it shows a slight schistosity parallel to the contact, probablythe result of th
. The Vermilion iron-bearing district of Minnesota : with an atlas . Greenstone ^.^?? Scale 50 100 feet // Soudan formation / (iron-bearing) /. Fig. 7.—Sketch showing relations of Soudan formation and Ely greenstone on Jasper XLV—03 li 210 THE VERMILION IRON-BEARING DISTRICT. atteutiou was paid to the contact between the irou formation and the green-stone, but very careful search showed no indication of anj clastic materialbetween them. Nearly everywhere this greenstone is perfectly massive; ina few places it shows a slight schistosity parallel to the contact, probablythe result of the shearing caused by the close folding. The iron formationis closely infolded in the syncline in the greenstone. The broadest part ofthe syncline—that is, the place where the jasper has its greatest width—isat the top of the hill. From this point down to the lake shore the descentis at a rather sharp angle, and the fold has here been beveled off. As aresult of this beveling a subordinate anticline is first brought to the surfaceas an oval area near the center of the main syncline, and as we come stillfarther south the deeper trun
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectgeology, bookyear1903
