Keywords: The Quarterly journal of the Geological Society of London (13889157039).jpg IN TIIE CHALK AVOLDS OF LINCOLNSHIRE <br> 163 <br> and the winding valley with its wooded sides sloping steepl ' up from <br> the water are features which one is not accustomed to associate with <br> hills and valleys in Chalk districts <br> Another remarkable ravine near Louth has been formed in the same <br> way The valleys of the small becks which descend from Tathwell <br> and Withcall respectively are filled with Boulder-clay ; they unite <br> near Hallington and thence the drift-filled valley continues eastward <br> and leads out of the Wolds a short distance south of Louth see fig 2 <br> The modern stream however deserts this ancient valley at a point <br> about three quarters of a mile E jST E of Hallington ; curving to the <br> north and passing through a deep gorge similar to those already de- <br> scribed it joins the Ludd near Thorpe Hall about half a mile west <br> of Louth <br> The ground thus cut through by the stream is some of the highest <br> near Louth and is known as Hubbards Hill while the depth of the <br> ravine in the centre cannot be far short of 100 feet To an observer <br> standing on the Boulder-clay in the continuation of the old valley <br> which is only some 20 feet above the bed of the stream and looking <br> northward into the mouth of the gorge which the stream has cut for <br> itself through the chalk hills the course of the stream seems most <br> remarkable; and the origin of the ravine is utterly inexplicable <br> except on the hypothesis that the pre-existent valley was once filled <br> with Boulder-clay up to the level of the hill-tops and that during <br> the process of re-excavation the beck found it easier to make a <br> passage northward over the Chalk than eastward through the mounds <br> of Bonlder-cla <br> 3 Valleys near Caistor ” The third locality where sirEiilar ravines <br> of Postglacial origin have been observed is the neighbourhood of <br> Hatcliffe a small village in the Wolds about 6 miles E of Caistor <br> Here there are no less than four new cuts through the Chalk in differ- <br> ent parts of one valley-system see plan fig 3 <br> Fig 3 ” Plan of the valley near Hatcliffe Scale and shading <br> as before <br> See map m Quart Journ Geol See xxxix p 600 <br> m2 36940934 113697 51125 Page 163 Text 40 http //www biodiversitylibrary org/page/36940934 1884 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 40 1884 Geology Periodicals Smithsonian Libraries bhl page 36940934 dc identifier http //biodiversitylibrary org/page/36940934 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-30 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13889157039 2015-08-26 05 51 36 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1884 Photos uploaded from Flickr by Fæ using a script |