. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. 710 KOCKS ALTERED BY GRANITE VEINS. [Ch. XXXTIL I have already hinted at the close analogy in the forms of certain granitic and trappean veins; and it will be found that strata pene- trated by phitomc rocks have suffered changes very similar to those exhibited near the contact of volcanic dikes. Thus, in Glen Tilt, in Scotland, alternating strata of limestone and argillaceous schist come in contact with a mass of granite. The contact does not take place as might have
. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. 710 KOCKS ALTERED BY GRANITE VEINS. [Ch. XXXTIL I have already hinted at the close analogy in the forms of certain granitic and trappean veins; and it will be found that strata pene- trated by phitomc rocks have suffered changes very similar to those exhibited near the contact of volcanic dikes. Thus, in Glen Tilt, in Scotland, alternating strata of limestone and argillaceous schist come in contact with a mass of granite. The contact does not take place as might have been looked for, if the granite had been formed there before the strata were deposited, in which case the section would have appeared as in fig. 738 ; but the union is as represented in fig. 739, Fig. 7as. Fig. m. Junction of granite and argillaceous schist in Glen Tilt. (MacCulloch.)* Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lyell, Charles, Sir, 1797-1875. New York, D. Appleton and co.
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectgeology, bookyear1868
