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| Keywords: The Quarterly journal of the Geological Society of London (12711710663).jpg 424 <br> PROCEEDINGS OF THE GEOLOGICAL SOCIETY Apr 4 <br> the various angles of inclination which they present to the miner who <br> explores them This tract oifers clear evidence that the porphyritic <br> eruptions were not only violent but successive and numerous during <br> the period of the Rothe-todte-liegende and that they overflowed strata <br> of that formation in the form of submarine coulees Here also as <br> indeed in many other parts of Central Germany we learn how these <br> dejections of contemporaneous porphyry and amygdaloid have been <br> occasionally so mixed up with pebbles and sand of the then existing <br> sea as to render it difficult in such cases to decide whether the stra- <br> tum should be considered as one of igneous or of aqueous origin In <br> all such extreme examples however the geologist who is seeking <br> after a truthful explanation of the works of nature will admit that <br> such strata are not to be dogmatically defined by one mineral term <br> only but that like the volcanic grit or ash of earlier periods they are <br> to be viewed as true indications of the internal heat of the crust which <br> in bursting forth repeatedly gave rise to those peculiar deposits which <br> resulted from a combination of subaqueous and volcanic causes <br> Weiss- or Grau-liegende � Kupfer-schiefer � Zechstein c <br> Weiss-liegende � The sandstones breccias and conglomerates of <br> which we have just spoken are succeeded in this region as in many <br> other parts of Germany by a band differing from all beneath it in <br> its light grey or whitish colour as derived from a quantity of pebbles <br> of white quartz in a grey paste This is truly a conglomerate made <br> up of rounded small stones which present all the appearance of having <br> been formed by waves upon a shore Since it forms the natural base <br> of the Copper-slate the miners necessarily applied to it the name of <br> ' liegende as underlying the productive mineral stratum This bed <br> or band for it varies in thickness from 3 or 4 feet to 30 or 40 may <br> be properly considered the base of the Zechstein or Magnesian lime- <br> stone division of the Permian rocks since in it after ascending through <br> the siliceous strata of the Rothe-todte-liegende we first find calcareous <br> matter beginning to show itself and with it a few rare fossils <br> Fig 4 � Diagram showing the Succession of the Fermian Rocks on the <br> Flanks of the Thuringerwald Horizontal distance about 4 miles <br> d Lower Bunter eS Sandschiefer <br> c4 Upper Zechstein Dolomite <br> / 3 Lower Zechstein Permian <br> c2 Kupfer-schiefer j Rocks <br> cl Weiss-liegende <br> b Rothe-todte-liegende J <br> a Coal-strata Upper Coal <br> p Porphyry <br> The accompanying diagram fig 4 shows the position of this <br> Weiss-liegende c ; and the open section in which we best saw it as 35615012 110213 51125 Page 424 Text v 11 http //www biodiversitylibrary org/page/35615012 1855 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 11 1855 Geology Periodicals Smithsonian Libraries bhl page 35615012 dc identifier http //biodiversitylibrary org/page/35615012 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-23 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12711710663 2015-08-26 20 58 15 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1855 Photos uploaded from Flickr by Fæ using a script | ||||
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