File:The Quarterly journal of the Geological Society of London (13937181962).jpg
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PALAEOLITHIC FLINT IMPLEMENTS IN KENT. 295 were, however, one or two points on which he ventured to differ from his old master. He alluded to the enormous amount of change which had affected the ancient land surface since the implements were formed. At that time the chalk-escarpment was further south. There must then, also, have probably been a greater rainfall, which entirely altered the conditions in a district occupied by such porous rocks. If the east and west valley were filled up to the extent of 200-300 feet, there would even now be streams running from the north where there are dry valleys. He believed that at an early period the gap through which the Darent flowed north did not exist, but that water ran through the east and west valley. The change of drainage could readily be accounted for if we accepted the proposition that a river in excavating its valley might intersect the source of another stream. If all this were accepted, we might in a great number of cases associate the high-level drifts with nuviatile action. In what Mr. Alfred Tylor had called the "pluvial period," a considerable number of sheets of water or lakes might also have been formed. He admitted the difficulty of associating the deposits with any existing water course. On the chalk-downs the red clay was the result of atmospheric denudation. Regarding the Currie-Wood drift, which he had described, he still believed that it might have been formed by a stream running northward. He agreed in the main with the Author's views, but did not accept the classification of the implements into three types, except in so far as they were affected by the matrix. In general form the facies of those from Ash reminded him of a small collection from the gravel of Reading, south of the Thames, from which the good specimens, if any, had been removed. Mr. Bell's discoveries near Limpsfield were also of great interest. When called upon to correlate these Kentish beds with those of the Glacial period, he could not go so far as the Author. He was glad to hear that Prof. Prestwich had more papers to bring forward, and till then he would suspend his judgment as to chronology; as regards closing up time, he thought the Author had used some very doubtful expressions. When we find valleys over a mile wide and 120 feet deep, as at Caversham, and traces of old river valleys on the site of the present Solent, all cut out since palaeolithic times, even allowing for an excessive power in the denuding agents, the subsequent changes must have occupied an enormous lapse of time. Mr. Topley said that Dr. Evans had well expressed the obligations which the Society were under to local observers. In the area described they had evidence of the extreme antiquity of certain deposits, as shown by the geological evidence. In the Somme area the gravels were in the actual valley, and the general explanation of their formation — the gradual excavation of the valley, and the greater antiquity of the higher terraces — was sometimes disputed; but at Ightham it was impossible to bring forward the ordinary objection, for gravels capped the tops of the watersheds. As regards the position of the patches of gravel at Penenden. |
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| Source | https://www.flickr.com/photos/biodivlibrary/13937181962 | ||
| Author | Geological Society of London | ||
| Full title | The Quarterly journal of the Geological Society of London. | ||
| Page ID | 36940100 | ||
| Item ID | 113696 (Find related Wikimedia Commons images) | ||
| Title ID | 51125 | ||
| Page numbers | Pl. XI | ||
| BHL Page URL | https://www.biodiversitylibrary.org/page/36940100 | ||
| Page type | Illustration | ||
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| Flickr posted date | 21 April 2014 | ||
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| current | 05:46, 26 August 2015 | | 1,806 × 1,074 (448 KB) | Fæ (talk | contribs) | == {{int:filedesc}} == {{BHL | title = The Quarterly journal of the Geological Society of London. | source = http://www.flickr.com/photos/biodivlibrary/13937181962 | description = PALAEOLITHIC FLINT IMPLEMENTS IN KENT. 295 <br> were,... |
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