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| Keywords: The Quarterly journal of the Geological Society of London (12895089403).jpg <br> of the outcrops of metamorphic rocks near Genoa that in the pass <br> to Lake Bigler a few miles south of Carson the lower exposures <br> and ridges of the granite present some remarkable evidences of <br> former stratification as seen in the accompanying outline-sketch <br> fig 2 These vertical masses of rock rise from 50 to 150 feet <br> above the crests of the ridges This structure is brought out more <br> clearly by weathering <br> III Hot Springs ” Thermal springs of considerable volume are <br> numerous in various parts of the Territory ; but the most extensive <br> and interesting are probably those known as the Steamboat Springs <br> about ten miles north-west of Virginia City and bordering on <br> Washoe Creek <br> The position of these springs is marked by columns of steam <br> rising in a line above a white mound about a quarter of a mile <br> long and forty or fifty feet higher than the bed of the creek Two <br> or three fissures extend through the centre of the whole length of <br> the mound and it is from these at different points that jets of <br> steam ascend The section fig 3 will show the form of the mound <br> and the relation of the springs to the adjoining rocks <br> Fig 3 ” Section across the Steamboat Springs <br> Washoe Creek <br> C Granite G Gravel L Limestone P Porphyry <br> S Deposit from the springs <br> The direction of the fissures is 15° to 20° N of W apparently <br> following the line of division between compact grey granite like <br> that of the Sierra Nevada and a bed of porphyry ; though this could <br> not be ascertained with any certainty owing to the thick deposit <br> produced by the springs and the alluvium beyond They vary from <br> three to twelve inches in width and are vertical but they are so <br> irregular and rugged at the sides that they cannot be probed or 36089585 111261 51125 Page 322 Text v 20 http //www biodiversitylibrary org/page/36089585 1864 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 20 1864 Geology Periodicals Smithsonian Libraries bhl page 36089585 dc identifier http //biodiversitylibrary org/page/36089585 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-03 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12895089403 2015-08-26 16 55 49 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1864 Photos uploaded from Flickr by Fæ using a script | ||||
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