File:The Quarterly journal of the Geological Society of London (14095863303).jpg

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VOLCANIC GROUP OF ST. DAVID'S.
305
In the nature then of the rocks which compose the Pre- Cambrian
mass which has its centre at St. David's, we have proof ot its
igneous origin, and of the gradual lessening of the magnitude and
clearness of the crystals as we approach the boundaries. The
spherulitic and other structures are also only to be met with in
truly igneous rocks. This being the case, and the relations of the
several members recalling those so well described by Prof. Judd in
the Island of Mull, We are justified in seeing in this group the
natural products of a volcanic area dissected for us by the hand of
time.
But however strong ma)- be the argument derived from this
particular mass, its force is greatly strengthened by the study of
two outlying areas, the one on the west and the other on the east,
in both which the association of the rocks and their minute structure
suggest, and are explicable by, an igneous origin alone.
That on the west is the remoter part of Eamsey Island, which
from a geological point of view presents truly magnificent features.
The finest section showing the relations of the rocks is seen on the
south side of Perth Hayog, as in the accompanying sketch (fig. 6).
Pig. 6. — View in Forth Hayog, looking South.
Towards the west we have massive rocks of felspar-porphyry, carved
by the sea into overhanging arches through which it roars and
foams, and contributing the huge blocks and rounded pebbles of
beautiful green-spotted rock which strew the shore. In a ravine
running south this suddenly comes to an end, and a straight fissure
is filled with a black substance (owing its blackness to the presence

Q. J. G. S. No. 158. X
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Source https://www.flickr.com/photos/biodivlibrary/14095863303
Author Geological Society of London
Full title
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The Quarterly journal of the Geological Society of London.
Page ID
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36941098
Item ID
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113697 (Find related Wikimedia Commons images)
Title ID
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51125
Page numbers
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Page 305
BHL Page URL
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https://www.biodiversitylibrary.org/page/36941098
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Text
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  • The Quarterly journal of the Geological Society of London. v. 40 (1884).
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Flickr posted date
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30 April 2014
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This file comes from the Biodiversity Heritage Library.

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.

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26 August 2015

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current05:13, 26 August 2015Thumbnail for version as of 05:13, 26 August 20151,204 × 2,076 (616 KB)Fæ (talk | contribs)== {{int:filedesc}} == {{BHL | title = The Quarterly journal of the Geological Society of London. | source = http://www.flickr.com/photos/biodivlibrary/14095863303 | description = VOLCANIC GROUP OF ST. DAVID'S. <br> 305 <br> In the nature then of the r...

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