File:The Quarterly journal of the Geological Society of London (13889855449).jpg

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LYDENBFKG AlfD DE KAAP, TRANSVAAL, SOUTH AiTRTCA.
571
the loNTer ground of the head of
the valley, it rises into hills and
ridges, some of which have a con-
siderable elevation. In some cases
it has weathered into bare round-
ed bosses bearing a striking re-
semblance to rocJies moutonnees ;
but over the greater part of the
area the surface of the granite is
decomposed into a soft brown
substance very much like an allu-
vial loam.
In the Kaap Yalley the surface
of the granite forms an ellipse
about 17 miles in length by 10
miles in width, with a narrower
prolongation in a northerly direc-
tion. It widens out again towards
the Krokodil E,iver, beyond which
it passes in under a series of rocks
which rest unconformably upon
those with which it has thus far
been in contact, and which will
probably be found to occupy the
remainder of the Kaap Yalley.
This mass of granite represents
a great centre of plutonic up-
heaval, of course posterior to the
period of the Kaap -valley rocks,
which it has greatly tilted all
around its margin ; it was, how-
ever, anterior to the deposition of
the rocks of the overlying uncon-
formable formation, as they are
still nearly horizontal.
3. Silurian'? Rocks. — jN'early all
around the granite centre is a
series of rocks which have been
tilted by it into a more or less
vertical position. These rocks are
siliceous and argillaceous, rarely,
and then but slightly, calca-
reous, being mainly schists, shales,
cherts, and quartzites. I believe
them to be " Silurian " rocks ;
but, with the exception of an
unreliable report of Graptolites
having been observed, there has
been hitherto (so far as I am aware)

a total absence of fossil evidence.
Date
Source https://www.flickr.com/photos/biodivlibrary/13889855449
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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37047451
Item ID
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114009 (Find related Wikimedia Commons images)
Title ID
InfoField
51125
Page numbers
InfoField
Page 571
Names
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NameFound:Graptolites NameConfirmed:Graptolites NameBankID:423327
BHL Page URL
InfoField
https://www.biodiversitylibrary.org/page/37047451
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).
Flickr tags
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Flickr posted date
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30 April 2014
Credit
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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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Date/TimeThumbnailDimensionsUserComment
current04:52, 26 August 2015Thumbnail for version as of 04:52, 26 August 20152,064 × 1,192 (440 KB)FlickreviewR 2 (talk | contribs)Replacing image by its original image from Flickr
03:57, 26 August 2015Thumbnail for version as of 03:57, 26 August 20151,192 × 2,078 (443 KB)Fæ (talk | contribs)== {{int:filedesc}} == {{BHL | title = The Quarterly journal of the Geological Society of London. | source = http://www.flickr.com/photos/biodivlibrary/13889855449 | description = LYDENBFKG AlfD DE KAAP, TRANSVAAL, SOUTH AiTRTCA. <br> 571 <br> the loNT...

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