Notes on the high-level river drift between Hanwell and Iver
1895; Elsevier BV; Volume: 14; Issue: 4 Linguagem: Inglês
10.1016/s0016-7878(95)80009-x
ISSN2773-0743
Autores Tópico(s)Hydrology and Sediment Transport Processes
ResumoT H E high-level river dr ift deposits between Hanwell (Middle- sex) and rver (Buck s) have been chosen as the subject of this paper because the exposure s in that district present features of great interest and importance.These depo sits have been und er ca reful investigation by me for man y years as fresh sect ions have been exposed, and from my voluminous notes thereon, I have selected for th e purpose of this paper such as may serve to ind icate the general character of these high-level drifts, their probable origin and formation .The evidence which will be brought forward will show that some, at least, of the deposits under review, are not the result of simple fluviatile agency, as has been generally supposed, but that large accumulations of ice-borne material seem to have actually formed at the time the river flowed at levels from above 180 ft.O.D. down to below the 75-foot contour in the districts und er investigation.Further than this, it will be suggested that vast masses of frozen gravel, sands, and clay were carried hodily into the stream itself, where they remain until to-day to tell their stor y.To such dep osits (the result of combined river-and ice-action) it is proposed to apply the term Fluvio-Glacial.In proposing this term for the very high-level dr ifts, it should be understood that the word glacial is employ ed in a local sense, and signifying, as Mr. Whit aker says, .. the occurrence of very cold or icy conditions."I would include in the Fluvio-Glacial deposits, as will be seen in the description of th e sections, some of the depo sits now described on the drift map s as "Glacial."It is difficult to distinguish them either in structure or composition from some forms of drift hitherto considered as fluviatile.They occur, among oth er places, west of Uxbridge and Hillingdon, and west of the Coln e Valley, and are only separated from known river drift by narrow patches of lower Tertiary, from which the drift has been denuded.It will be Shown that the se so-called glacial deposits are found, like the river drift, descending the slope of the hills from the higher ground to the north in Middlesex and Bucks to the same level as, or even to a lower contour than, the known river drift at Uxbridge Common, Hillingdon, etc. Alluding to these drifts, Mr. Whitaker has said : "The glacial drift may contain beds * T h is pa per was read with speci al reference to the E xcu rsion of ath May, 1893, for
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