File:The Quarterly journal of the Geological Society of London (12960150353).jpg

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96
PROF. T. G. BONNET S PETROLOGICAL NOTES ON THE
places the " quartzite " series crosses for a short space over to this
left bank of the former valley.
We have thus a very irregular slip of Hebridean gneiss, capped in
part by some Torridon Sandstone, bounded by two or more faults,
which bring down the quartzite and calcareous series on the one hand
and the newer gneiss series on the other (figs. 2 & 3)*.
In the section given by Sir E,. Murchison (Q,. J. G. S. vol. xvii.
p. 191) a small patch of " syenite" is also marked as occurring on
the right bank of Loch Maree, near its head. Of the gneissose
character of this I have not any doubt ; but I also found there a
rock which, both macroscopically and microscopically, appears to be
a true diorite. I saw no signs of intrusion, and think the presence
of this patch of the older rock may be explained by faulting, though
I am not prepared at present to say in what manner that is to be
connected with the other faults.
Fig. 2. — Section in Glen Laggan along the line A in fig. 1.
Fault. Fault.
Fig. 3. — Section in Glen Laggan along the line B in fig. 1.
Fault.
(2) Hebridean Gneiss, together with the so-called Syenite.
The macroscopic characters of this rock in the present district
have been already described by previous observers, so it wiU suffice
to make a few remarks on the microscopic structure of the specimens
which^ I collected. These were obtained from the above-named
localities m Glen Laggan, at intervals on the right bank of Loch
.* . ^^ad with me a copy of Dr. Hicts's section (vol. xxnv. p. 814), but entirely

tailed to reconcile it with what I saw on the ground.
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Source https://www.flickr.com/photos/biodivlibrary/12960150353
Author Geological Society of London
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The Quarterly journal of the Geological Society of London.
Page ID
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36090431
Item ID
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111264 (Find related Wikimedia Commons images)
Title ID
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51125
Page numbers
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Page 96
BHL Page URL
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https://www.biodiversitylibrary.org/page/36090431
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Text
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  • The Quarterly journal of the Geological Society of London. v. 36 (1880).
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Flickr posted date
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6 March 2014
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This file comes from the Biodiversity Heritage Library.

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