MAKE A MEME
View Large Image
| View Original: | The_Quarterly_journal_of_the_Geological_Society_of_London_(13205119874).jpg (1196x2076) | |||
| Download: | Original | Medium | Small | Thumb |
| Courtesy of: | commons.wikimedia.org | More Like This | ||
| Keywords: The Quarterly journal of the Geological Society of London (13205119874).jpg 406 C CALLAWAY ON THE NEWER GNEISSIC <br> We have thus a twofold discordance Prom north to south gneiss <br> is brought against higher beds of quartzite and quartzite is brought <br> against higher beds of gneiss <br> Junction North of Hope Ferry ” The high ground above the ferry is <br> occupied by gneiss on the strike of the gneiss on Ben Arnaboll; and <br> this rock forms the crags overhanging the Hope river to near <br> Inverhope where the Quartzite comes in In the cliffs to the north- <br> east of Inverhope the gneiss is sometimes very hornblendic sometimes <br> passing into hornblende-schist Here there is also a felspathic schist <br> somewhat like a banded halleninta No actual junction is seen <br> but the Arnaboll gneiss apparently overlies the inverted Quartzite <br> We now come to the striking and instructive section exposed in <br> Whitten Head fig 11 In these tremendous cliffs the junction <br> Fig 11 ” Section at Whitten Head Scale 1 inch to about 500 feet <br> W E <br> of the two groups is exposed as clearly as in a diagram the snow- <br> white quartzite forming a vivid contrast to the gneiss with its <br> stripes of red and dark-green colours The line of separation is an <br> irregular fracture which first inclines for a short distance towards <br> the west then turning at an obtuse angle it hades in an easterly <br> direction down to the base of the precipice The hade being to the <br> upthrow the fault is of course reversed Both series dip easterly <br> at about the same angle the result being that at some parts of <br> the fault the gneiss rests conformably upon quartzite Had the <br> rocks been exposed only upon horizontal surfaces the two groups <br> would have seemed perfectly conformable This section thus shows <br> how those appearances have sometimes been caused which have <br> led observers to infer a clear ascending series <br> North of the Head are two remarkable pinnacles of quartzite <br> rising like gigantic columns out of the sea Nearer the cliffs is a <br> third stack into which according to Murchison a shaft of felspar- <br> rock has been intruded My reading of the facts is widely <br> different The pinnacle is a mass of quartzite dipping gently to <br> the west and resting upon a base of red and dark-green gneiss <br> There may be granite veins in the gneiss the distance from which <br> the rock was observed was too great for the determination of this <br> point ; but certainly no intrusive rock passed up into the quartzite <br> the basement beds being unbroken and nearly horizontal This <br> superposition of the quartzite on gneiss is on the west side of the 36929013 113681 51125 Page 406 Text 39 http //www biodiversitylibrary org/page/36929013 1883 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 39 1883 Geology Periodicals Smithsonian Libraries bhl page 36929013 dc identifier http //biodiversitylibrary org/page/36929013 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-16 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13205119874 2015-08-26 12 55 14 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1883 Photos uploaded from Flickr by Fæ using a script | ||||
.jpg){kind=link}
