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| Keywords: The Quarterly journal of the Geological Society of London (13936974491).jpg CEYSTALLINE E0CKS OE THE ALPS 87 <br> schists and fine-grained gneisses Of these rocks the garnet-bearing <br> schist is exactly like a variety which occurs in the Tremola-schist <br> group of the Central Alps ; the remainder resemble the gneisses and <br> schists met with on the west side of the Piora lake and on the upper <br> part of the Gt St Bernard pass These appeared to come from the <br> more southern set of ravines and recalled to mind the rocks men- <br> tioned above with which they undoubtedly correspond The white <br> quartz-schist which is very like varieties found in the Yal Piora <br> and south of the Gt St Bernard occurs in situ near the top of the pass <br> leading to Kals It dips at an angle varying from 30° to 45° to <br> S S W or a little nearer S It is apparently underlain by chloritic <br> schist and that by the usual mica-schist ; but I suspect an inversion <br> due to folding <br> The path up the main valley north of Windisch-Matrei for some <br> miles runs entirely over members of the TTionglimmerschiefer series <br> The chateau crowns a projecting mass of white marble quartz- <br> veined at the base apparently dipping towards the S On this side <br> a calcareous mica-schist Kalkglimmerschiefer V H is exposed at <br> the base of the crags and in the valley below is well displayed near <br> the bridge over the river dipping at a high angle about 75° to <br> S S E This rock is lithologically identical with some of the Jcalk- <br> haltige Schiefer of the Central Alps At this point the cleavage-foli- <br> tion is parallel with the stratification-foliation The path now on <br> the right bank of the torrent winds up and over a great mass of this <br> rock which continues to dip in the same general direction but <br> perhaps not quite so steeply the strike varying between E S E and E <br> Beautiful examples of corrugation are displayed and the indepen- <br> dence of the cleavage- and the stratification-foliation though in general <br> the two are coincident in direction is indubitable The accompany- <br> ing diagram fig 6 p 88 ” a fairly careful copy of a part where the <br> cleavage-foliation is not very strongly developed and cuts across a <br> corrugation ” will serve to prove this and will indicate how closely <br> the stratification-foliation simulates if it does not signify a structure <br> produced by some kind of sedimentation As the path approaches <br> the brink of the gorge of the Tauern chloritic schist is seen to rise <br> on the opposite bank close to a waterfall from beneath the calca- <br> reous schist the change from the one rock to the other indicated <br> by a little ravine and a pile of screes being rather rapid Presently <br> the chloritic schist appears on the right bank the calc-schist be- <br> coming at its base harder and more calcareous its cleavage-foliation <br> probably coincident with the other structure dipping to S at about <br> 50° Screes mask the actual junction ; but after about 22 yards the <br> chloritic schist at first seemingly rather calcareous crops out the <br> cleavage-foliation dipping as before After a while the chloriric <br> schist becomes more distinctly banded chloritic alternating with <br> epidotic layers as the felspathic bands are associated with the horn- <br> blendic in several localities in the Lizard peninsula A greenish <br> mica-schist intermediate in character between the two types or <br> oscillating from the one to the other which succeeds finally passes <br> into a typical Tcallchaltiger Schiefer containing a darkish mica with 36939868 113696 51125 Page 85 Text 45 http //www biodiversitylibrary org/page/36939868 1889 Geological Society of London NameFound Piora NameConfirmed Piora EOLID 5121761 NameBankID 1803097 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 45 1889 Geology Periodicals Smithsonian Libraries bhl page 36939868 dc identifier http //biodiversitylibrary org/page/36939868 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-21 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13936974491 2015-08-26 06 53 23 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1889 Photos uploaded from Flickr by Fæ using a script | ||||
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