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| Keywords: The Quarterly journal of the Geological Society of London (12734411654).jpg T BELT ON THE STEPPES OE SIBERIA <br> 493 <br> in the immediate neighbourhood ; the <br> fragments distributed over the plains <br> were entirely unworn Where ex- <br> cavations had been made they were <br> seen to be much more numerous on <br> the surface than below The ridges <br> and hills were covered with shattered <br> fragments of the rocks of which they <br> were composed ; nowhere were there <br> any signs that they had ever suppor- <br> ted glaciers though probably they <br> had been exposed to the action of <br> intense frost If we suppose that the <br> plains had been covered with water <br> forming shallow lakes the distribu- <br> tion of the angular fragments over <br> their surface can be easily accounted <br> for as these lakes would be frozen <br> over in winter and on the ice break- <br> ing up in the spring it would carry <br> away fragments of rocks from the <br> surrounding ridges and drop them in <br> various parts of the lakes I have <br> reason to believe this cause sufficient <br> as I have seen it in operation in the <br> lakes of North America and described <br> it in a paper read before this Society <br> in 1864 <br> The country beyond this to the <br> southward although still called the <br> Kirghese steppes had lost its level <br> character and some of the ridges of <br> crystalline rocks rose to heights of at <br> least 2000 feet none of which showed <br> any signs of glaciation excepting that <br> the surface had been shattered by <br> intense frost The true plains may <br> be said to end on this meridian about <br> lat 51° N ; whilst to the north-east <br> they extend diagonally across Siberia <br> for 3000 miles Over this enormous <br> range of country their internal con- <br> stitution seems to be the same as that <br> of the plains I traversed ; at Sama- <br> rova however on the same meridian <br> as Ischim but 345 miles further north <br> Erman states that the yellow talcose <br> clay of which the plains consist rests <br> on another filled with large fragments <br> of rock and says it must be assumed <br> Ol – <br> Aj <br> ” e <br> ' – ';;-; v 35766414 110599 51125 Page 492 Text v 30 http //www biodiversitylibrary org/page/35766414 1874 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 30 1874 Geology Periodicals Smithsonian Libraries bhl page 35766414 dc identifier http //biodiversitylibrary org/page/35766414 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-24 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12734411654 2015-08-26 20 03 50 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1874 Photos uploaded from Flickr by Fæ using a script | ||||
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