5I the HISTORY of the DRAINAGE of the HAMPSHIRE BASIN And
»5i THE HISTORY OF THE DRAINAGE OF THE HAMPSHIRE BASIN and the Relation of Prehistoric Man to that History. BY REGINALD W. HOOLEY, F.'G.S. In endeavouring to trace the history of the drainage of the Hampshire Basin, we soon discover that the present physical features reveal few signs of its beginning. In view of the present insignificance of the rivers and the comparative insufficiency of their watersheds, the work, which they, aided by subseriaJ agencies, have accomplished in the excavation of their valleys is stupendous. Their wide, open valleys, the terraces of gravel on their flanks, the sheets of gravel on the plains bordering their valleys are conclusive evidence that the conditions now obtaining are totally inadequate to explain the observed phenomena ; these can only be deciphered by an acquaintance with the geology of the district. Great earth movements resulting in elevation and subsidence, and the formation of water-partings, the origin of the superficial deposits and raised sea-beaches, the effects of marine and subaerial denudation, changes of climate and the immense period during which the forces of nature have been at work— all have to be taken into consideration. The strata drained by the rivers of the Hampshire Basin belong to the Secondary and Tertiary formations. After the deposition of the Tertiary strata, in the Miocene Period, a profound upheaval began, raising the South East of England above the sea and puckering the strata into a .series of folds with their long axes running approximately North West and South East, with one great fold, the Wealden anticline, over-topping, and far greater in extent than the others.
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