File:The Quarterly journal of the Geological Society of London (13937160882).jpg
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[edit]DescriptionThe Quarterly journal of the Geological Society of London (13937160882).jpg |
PALEOLITHIC FLINT IMPLEMENTS IN KENT. 291 affords, however, better evidence of glacial action. This gravel, which consists in greater part of perfectly angular and unrolled white flints, with a few Tertiary pebbles, and occasionally with fragments of chert, is unstratified, and looks as though it had been forced down, irregu- larly as it were, into the underlying Gault, by pressure from above. The flints are often pitted or pock-marked. The section, however, at Park-Farm brick-pit is small and insufficient. This gravel is better developed and possesses more distinctive characters in other parts of the Holmesdale valley, and I will therefore reserve the fuller account of it to a future occasion, when I shall be able to give more definite reasons for its origin. I showed *, many years ago, that the great trough or valley of Holmesdale, in which this drift has been deposited, is of more recent date than the extensive spread of " red clay with flints " which lies on the top of the chalk hills. Consequently the brown- stained flint- drift, which has now been traced to the edge of the escarpment, where, like the red clay, it suddenly ends, together probably with the associated rude flint implements, must also be of older date than the valley, and therefore anterior to the Postglacial "river-drifts" of these tributaries of the Medway and the Thames valleys, which lie in them. I have also shown f that there has been, at a time probably before that of the northern drift or Boulder-clay series, a drift from the south which carried the chert and ragstone of the Lower Greensand across the chalk-escarpment into the Thames valley — not in the line of the present river-valleys, but traversing the high chalk plain, and capping the summit of some of the higher hills in the London basin. Still it seems not to be universally distributed, but to keep to certain lines, springing from the lower, but still high, points or gaps in the chalk-escarpment J. Amongst the drift-capped hills of the Thames valley is that of Swanscombe Wood, 51 miles north of Ash, and 306 ft. § above J). It consists of an outlier of London Clay, with a capping of this southern drift, which there consists, according to a note I made some years ago of a small shallow section then existing by the Old Telegraph, of : — Tertiary flint pebbles (Woolwich beds). Subangular fragments of brown chert ... 1 „ „ of bright red chert . Lower Greensand. ,, „ of yellow ragstone J Subangular flints, not coloured. Flints, much rolled and worn and stained deep brown. Green-coated flints (Thanet Sands). The above are placed in the order of their relative abundance. The brown and red cherts are from the Lower Greensand of the "On the Origin of the Sand and Gravel Pipes in the Chalk," &c, Quart. Journ. Geol. Soc. vol. xi. p. 73 (1854). t Eeports Brit. Assoc. York, 1881, p. 621. I Thus far this brown flint-drift appears to be generally associated with rude flint implements ; but the inquiry is yet new and needs more extended obser- vations. § This is 220 ft. above the high-level terrace of implement-bearing river- gravel atSwanscombe. |
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Source | https://www.flickr.com/photos/biodivlibrary/13937160882 | ||
Author | Geological Society of London | ||
Full title InfoField | The Quarterly journal of the Geological Society of London. | ||
Page ID InfoField | 36940084 | ||
Item ID InfoField | 113696 (Find related Wikimedia Commons images) | ||
Title ID InfoField | 51125 | ||
Page numbers InfoField | Page 289 | ||
BHL Page URL InfoField | https://www.biodiversitylibrary.org/page/36940084 | ||
Page type InfoField | Text | ||
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Flickr tags InfoField |
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Flickr posted date InfoField | 21 April 2014 | ||
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current | 05:47, 26 August 2015 | 1,166 × 2,104 (629 KB) | Fæ (talk | contribs) | == {{int:filedesc}} == {{BHL | title = The Quarterly journal of the Geological Society of London. | source = http://www.flickr.com/photos/biodivlibrary/13937160882 | description = PALEOLITHIC FLINT IMPLEMENTS IN KENT. 291 <br> affords... |
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