. Transactions. n taken as thetype-locality because of the extensive mining-operations whichexpose excellent sections of the fresh limestone and its residualdecay for study. The fresh rock is a recrystallized magnesian limestone. Thefirst and early stage of weathering is a physical crumbling ofthe crystalline rock into a dolomitic sand, varying from lightto brown red in color, in which only slight oxidation is stripped of its residual decay, the limestone presents anexceedingly irregular pinnacled or chimneyed surface, asshown in Fig. 19. The limestone chimneys are buried to avariab
. Transactions. n taken as thetype-locality because of the extensive mining-operations whichexpose excellent sections of the fresh limestone and its residualdecay for study. The fresh rock is a recrystallized magnesian limestone. Thefirst and early stage of weathering is a physical crumbling ofthe crystalline rock into a dolomitic sand, varying from lightto brown red in color, in which only slight oxidation is stripped of its residual decay, the limestone presents anexceedingly irregular pinnacled or chimneyed surface, asshown in Fig. 19. The limestone chimneys are buried to avariable depth by the decay, with the decay covering the in-ter-areas, reaching in extreme cases, a depth of nearly 100 general character of the clays forming the residual cover-ing is red in color and highly ferruginous in composition. A characteristic feature of the weathered surface of the un-covered limestone chimneys is a pronounced irregular pittedaspect, shown in Fig. 20. A close examination of the lime-. Fig. 19.—View in Open Cut of the New Kiver Mineral CompanysMines at Ivanhoe, Va., Showing the Typical Pinnacled or Chim-neyed Surface of Limestone Kesulting from Weathering. (, photo.)
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
