. Annual Reports of the Department of the Interior for the Fiscal Year Ended June 30, 1900--Twenty-First Annual Report of the United States Geological Society. UPPER HURON IANUPPER MARQUETTE ^Alk^ Diabase ordiorite Ishpemmg formation MicWgamme slate Kona dolomite ARC NORTHERN AND Palmer gneiss Mona scrdst Kilt GEOLOGICAL SECTIONS OF ON LINES 1,11, m, BY HIS Horiz^ ?/a »90 660 330 O Vert TWENTY-FIRST ANNUAL REPORT PART III » BICN »C0 LITM « V VAN HisE.] MARQUETTE DISTRICT. 373 cherty iron-bearing carbonates, ferruginous slates, ferruginous cherts,jaspilites, griineritic magneti
. Annual Reports of the Department of the Interior for the Fiscal Year Ended June 30, 1900--Twenty-First Annual Report of the United States Geological Society. UPPER HURON IANUPPER MARQUETTE ^Alk^ Diabase ordiorite Ishpemmg formation MicWgamme slate Kona dolomite ARC NORTHERN AND Palmer gneiss Mona scrdst Kilt GEOLOGICAL SECTIONS OF ON LINES 1,11, m, BY HIS Horiz^ ?/a »90 660 330 O Vert TWENTY-FIRST ANNUAL REPORT PART III » BICN »C0 LITM « V VAN HisE.] MARQUETTE DISTRICT. 373 cherty iron-bearing carbonates, ferruginous slates, ferruginous cherts,jaspilites, griineritic magnetite-schists, detrital ferruginous rocks, andore bodies. The original rock of the Negaunee iron-bearing formation was acherty iron-bearing carbonate, precisely as in the districts alreadydescribed. Furthermore, at various places the iron carbonateapproached very closely to a siderite. The metamorphism of theformation is less simple than in the districts already described, in thatthere have been two periods of alteration. In inter-Marquette time theerosion cut deep enough to expose the Negaunee formation. The upperpart of this formation which was in the belt of weathering was largelytransformed into ferruginous slates and ferruginous cherts. In earlyUpper Marquette time detrital material, largely derived from theNegaunee formation, accumulated, thus making a horizon at the base ofthe Upper Marquette series largel}^ composed of iro
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Keywords: ., bookauthorunitedst, bookcentury1900, bookdecade1900, bookyear1901
