File:The Quarterly journal of the Geological Society of London (14076839874).jpg

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76 PEOF. A. H. GEEElJf Olf A SECTIOJT iST.AE LLAJ!fBEElS.
north-west, and the conglomerate creeps over the flaky rocks
with a rapidly increasing thickness till it conies down to the level of
the railway. This conglomerate has the same character as that seen
on the other side of the flaky rocks ; it contains a few fine slaty
bands which give the dip and show that the beds are rnnning down
at moderate angles to the north-west. I could not see the actual
junction of the flaky rocks with the grits to the south-east of them,
but I traced the two to within a few feet of one another, and it
seemed likely that they were separated by a fault.
Eig. 2. — Enlarged Section hetiueen the j)oi7its P and Q, in fig. 1.
N.W. S.E.
Conglomerate. , Grit.
Dyke.
c
A. Fissile flaky rock. B. Greenish-grey fragmental rock.
C. Grey breccia.
There seems to me no room for doubt that in this section we see
the top of a projecting boss of a group of rocks underlying the
Harlech and Llanberis beds, and that the conglomerate rests on these
rocks with the strongest possible unconformity.
Further proof of the unconformity is found when we examine the
hill side on the north-east of the railway. Por some way up (fig. 3)
Pig. 3. — Section at right angles to the Railivay, hetiueen the points
P and Q,.
S.W. IST.E,
Eailwav.
we find the fissile rocks peeping out every here and there in gullies
and other depressions, with the conglomerate lying upon their edges.
I am afraid it may be thought that I have been unnecessarily
prolix in my account of this small section, and I certainly should
not have thought that there was any need to give, at such length, the
evidence for what seems to myself a very simple matter, if it had
not been for the following circumstance. I believe that the section
just described is the one figured by Sir A. Eamsay in the Survey
Memoir on Xorth Wales (pp. 178, 179, figs. Q2 and 63), and he

there gives a reading of it very different from my own. He calls
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Source https://www.flickr.com/photos/biodivlibrary/14076839874
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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37046914
Item ID
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114009 (Find related Wikimedia Commons images)
Title ID
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51125
Page numbers
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Page 76
BHL Page URL
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https://www.biodiversitylibrary.org/page/37046914
Page type
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Text
Flickr sets
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  • The Quarterly journal of the Geological Society of London. v. 41 (1885).
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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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This image was originally posted to Flickr by BioDivLibrary at https://flickr.com/photos/61021753@N02/14076839874. It was reviewed on 26 August 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

26 August 2015

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