MAKE A MEME View Large Image The Quarterly journal of the Geological Society of London (12645461664).jpg all the enclosed <br> portions which can be supposed to have had a mechanical origin are <br> flattened between the planes of cleavage but nothing of the sort can ...
View Original:The_Quarterly_journal_of_the_Geological_Society_of_London_(12645461664).jpg (1188x2004)
Download: Original    Medium    Small Thumb
Courtesy of:commons.wikimedia.org More Like This
Keywords: The Quarterly journal of the Geological Society of London (12645461664).jpg all the enclosed <br> portions which can be supposed to have had a mechanical origin are <br> flattened between the planes of cleavage but nothing of the sort can <br> be observed of the crystals which are scattered through the mass <br> without any reference to the cleavage-planes either in their form or <br> position <br> In good roofing-slates which are distinguished by the fineness and <br> uniformity of their grain it is difficult to observe the forms of the <br> parts of which they are composed yet even in these with the assist- <br> ance of a lens we can see that the constituent particles are flattest <br> between the cleavage-planes and longest along the dip of the cleavage <br> Thus under whatever circumstances we are able to observe the forms <br> of the component parts of slate or of the foreign bodies contained in <br> it whether these are pebbles fragments of other rocks or organic <br> remains we find evidence that the mass has been compressed by a <br> force which has acted in a direction perpendicular to the planes of <br> cleavage <br> The distinctive character of slate appears to he that it is composed <br> of particles of a form more or less amygdaloidal arranged in a similar 35268755 109512 51125 Page 113 Text v 5 http //www biodiversitylibrary org/page/35268755 1849 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 5 1849 Geology Periodicals Smithsonian Libraries bhl page 35268755 dc identifier http //biodiversitylibrary org/page/35268755 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-20 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12645461664 2015-08-27 10 50 52 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1849 Photos uploaded from Flickr by Fæ using a script
Terms of Use   Search of the Day