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| Keywords: The Quarterly journal of the Geological Society of London (13889826060).jpg 252 <br> J H COLLIJS'S ON THE GEOLOGY <br> often have fimbriated extremities as shown in fig 1 where a is the <br> lode-fissure 6 the porphyry and c the slate <br> Fig 1 ” Section showing Forpliyritic Masses <br> a Lode-fissure <br> h Porphyry <br> Slate <br> Their general direction is so similar to the strike of the slates and <br> their length is so much greater than their breadth that they appear <br> to be interstratified unless the junctions are very closely examined <br> When however such examinations are made the true nature of the <br> association of the rocks is obvious enough for the slates abut <br> against the porphyries without in any way bending round them or <br> else the porphyry breaks up into branches and fingers which <br> are thrust between the laminae of the slates as in fig 1 This latter <br> mode of occurrence may be well seen on the hill above Puerto Eubio <br> A bending of the laminas of slate around the porphyry is almost <br> if not quite unknown <br> In a few places the porphyrj appears to be much like granulite <br> This is particularly observable between the Fuente Fria water- <br> deposit and the first llalaiio Where the porphyries meet the slates <br> by a faulted junction as is frequently the case a thick mass of <br> fault rock is often observable at these junctions This may be <br> verj well seen in the railway- cutting on the west side of the Mesa <br> de los Pinos see fig 2 and on the Zalamea road about half a mile <br> Fig 2 ” Section in Railway -cutting on the luest side of the Mesa <br> de los Pinos <br> h Porphyry <br> Slafce <br> d Fault-rock <br> west of Bella Yista both localities being situated oii prolongations <br> of the Yalley lode It is also well seen at the foot of the hill <br> In this railway -fault the slates c are inclined at a very high angle to the <br> north They only appear to have a low angle because of the direction of the <br> line of section which forms but a very small angle with the line of strike 37047108 114009 51125 Page 252 Text 41 http //www biodiversitylibrary org/page/37047108 1885 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 41 1885 Geology Periodicals Smithsonian Libraries bhl page 37047108 dc identifier http //biodiversitylibrary org/page/37047108 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-30 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13889826060 2015-08-26 04 56 10 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1885 Photos uploaded from Flickr by Fæ using a script | ||||
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