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File:The Quarterly journal of the Geological Society of London (14073294851).jpg

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74
PB0CEEDr5rGS OF THE &EOLOGICAI. SOCIETT.
may call type-forms to justify us in the assumptioii of the existence
of species for purposes of classification, and I tmst that I have
indicated a natoral and logical principle on which to proceed. The
relations, then, of the groups may be expressed graphically in the
annexed diagram.
In the above sketch of what appears to me a natural system of
classification, I take no notice, as above stated, of the geological age
of the rock, which is regarded as of primary importance by many
continental investigators, who consider Pre-Tertiary igneous rocks

always separable from those of later date. For this distinction I
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Source https://www.flickr.com/photos/biodivlibrary/14073294851
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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37047564
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 74
BHL Page URL
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https://www.biodiversitylibrary.org/page/37047564
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Text
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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@N02/14073294851. 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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Date/TimeThumbnailDimensionsUserComment
current04:53, 26 August 2015Thumbnail for version as of 04:53, 26 August 20152,016 × 1,183 (272 KB)FlickreviewR 2 (talk | contribs)Replacing image by its original image from Flickr
03:55, 26 August 2015Thumbnail for version as of 03:55, 26 August 20151,183 × 2,018 (276 KB)Fæ (talk | contribs)== {{int:filedesc}} == {{BHL | title = The Quarterly journal of the Geological Society of London. | source = http://www.flickr.com/photos/biodivlibrary/14073294851 | description = 74 <br> PB0CEEDr5rGS OF THE &EOLOGICAI. SOCIETT. <br> may call type-form...

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