Geological facts; or, the crust of the earth, what it is, and what are its usesBarrett, W. G. (William Garland)
Religion
Geological facts; or, the crust of the earth, what it is, and what are its uses
Barrett, W. G. (William Garland)
Geology
globe, and without me your scenery would lose its grandeur and its
glory. But for me Albert Smith had never climbed Mont Blanc, nor
Humboldt Cotopaxi and Chimborazo; nor would the head of the famed
Egyptian Memnon[18] have been sculptured. You may see me giving to
Cornwall, Wales, and Scotland their most valuable minerals and metals.
In Europe
‘I am monarch of all I survey,
My right there is none to dispute.’
The Scandinavians, the Hartz mountains, the Alps, and the Pyrenees are
mine; nor is my territory less in Asia, Africa, the great Americas, and
in the becoming great Australia; and thus, by my deeply rooted
foundations and my vast extension, I constitute the framework, solid and
immoveable, of this ‘great globe and all that it inherits.’”
Thus, at any rate, the granite might speak, nor would there be one word
of vain boasting in it. Having beard it, or fancied we heard it, which
amounts to the same thing, let us soberize ourselves, and put granite
into the third person. There are no fossils in granite and the other
Plutonic and volcanic rocks; even supposing any forms of life to have
been in existence at the period to which we are referring, the action of
fire has annihilated all their remains. We should not therefore expect
in Cumberland and Cornwall, nor in those parts of Devonshire where
granite prevails, to find the fossils peculiar to other formations with
which in time we hope to make familiar acquaintance. But though
destitute of interest in this respect, how great is its importance and
interest in those economic uses which have the geologist for their
guide, and the whole family of man for their beneficent operations!
“Many varieties of granite are excellent as building stones, though
expensive in working to definite forms. Some of the most important
public works of Great Britain and Ireland, France and Russia, are of
this material. In selecting granite, those varieties in which the
constituent minerals and the scales of mica are superabundant, should be
avoided; and, as a practical test, it is wise to notice the country
immediately around the quarry, as the sandy varieties rapidly
disintegrate,[19] and form accumulations of micaceous sand. The Hayter
or Dartmoor granite, the Aberdeen granite, the Kingstown (Dublin)
granite, some beds of the Mourne or county of Down granite, and the
Guernsey or Channel Island granite, are well known for their excellence.
In some of the quarries the bedding of the granite is more defined than
in others; and wherever this is the case, or where marked cleavages or
joints prevail, the work is much facilitated. Many old Egyptian works
and statues were formed of granite, and it is still used for colossal
works, as it takes a fine polish. For example, the great fountain shell,
or vase, before the Museum at Berlin, and the pedestal of Peter the
Great at St. Petersburg, are of the northern granite, being sculptured
from erratic blocks.
Public-domain text, read in full here on John Shaqi.
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