Architectural variety and solidity are favoured in the buildings of the city by a wealth of beautiful building stones of varied colours (limestones, sandstones, lavas, granites and marbles), in addition to which bricks and Roman tiles are employed. [Please select]
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No one can travel there without becoming tiresomely familiar with fine-grained, shattered schists, coarse granites, and their curiously banded relatives, the gneisses. [Please select]
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The thousands or tens of thousands of feet of rock which once overlay the schists and still more the granites and gneisses must have been slowly removed by erosion, for there was no other way to get rid of them. [Please select]
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The grayer granites may often be used with good effect, as well as the coarse porphyries, when the gray is to be particularly warm. [Please select]
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Wherever the river has cut its way through the sandstones, marbles and granites of the Kaibab Mountains, beautiful and awe-inspiring pictures are seen, while above there are domes and peaks, some of red sandstone and some of snowy whiteness. [Please select]
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And geologists are now able to state with tolerable confidence that, however old many of the granites may be, yet a large amount of the fire-built rocks are no older than the water-built rocks which lie over them. [Please select]
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Granites and lavas are about one-half quartz. [Please select]
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