Reports On the Physical, Descriptive, And Economic Geology of British Guiana
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It appears to me to be a rock, intermediate in composition between quartz-porphyry and granite. Beyond the last-mentioned cataract common granite appears, and is soon after succeeded by the intermediate variety. The rocks thereabout have the black coating so frequently seen upon them, but which is- not found of the same sort on any rocks further down the Cotinga river. This polish does not appear to me to be a deposit from the water, but the result of a chemical action of the latter upon the de...composing sm-face of the rock. A copper coloured rusty-looking polish is seen on some of the rocks in the lower parts of the same river.
The rocks forming the great ridge between the savanna and the valley of the Waiquah river, are composed of a whitish granite containing but little mica, which has quartz veins in it. This huge roll of granite is continuous with that at the Unamara river, and skirts the edge of the quartz-porphyry. Near the pass on the ridge there are two curious rocks, one called Piatzang, which is very large and tabular, and the other of a rounded form, and having a height of about 20 feet, is spht vertically and horizontally into four divisions, aU of which are weathering into spherical masses.
What to read after Reports On the Physical, Descriptive, And Economic Geology of British Guiana?
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To quickly assess the difficulty of the text, read a short excerpt:
It appears to me to be a rock, intermediate in composition between quartz-porphyry and granite. Beyond the last-mentioned cataract common granite appears, and is soon after succeeded by the intermediate variety. The rocks thereabout have the black coating so frequently seen upon them, but which is- not found of the same sort on any rocks further down the Cotinga river. This polish does not appear to me to be a deposit from the water, but the result of a chemical action of the latter upon the de...composing sm-face of the rock. A copper coloured rusty-looking polish is seen on some of the rocks in the lower parts of the same river.
The rocks forming the great ridge between the savanna and the valley of the Waiquah river, are composed of a whitish granite containing but little mica, which has quartz veins in it. This huge roll of granite is continuous with that at the Unamara river, and skirts the edge of the quartz-porphyry. Near the pass on the ridge there are two curious rocks, one called Piatzang, which is very large and tabular, and the other of a rounded form, and having a height of about 20 feet, is spht vertically and horizontally into four divisions, aU of which are weathering into spherical masses.
What to read after Reports On the Physical, Descriptive, And Economic Geology of British Guiana?
You can find similar books in the "Read Also" column, or choose other free books by Geological Survey of Great Britain to read onlineMoreLess
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