. A regional geography of the world, with diagrams and entirely new maps . the Wash. Its direction may be com-pared with that of the Warwick Avon. After havingpassed through the Goring Gap the main stream entersupon its lower course, which lies across the LondonBasin. Measures of three main kinds fill the trough formedin the great sheet of chalk which underlies the LondonBasin. Immediately above the chalk are [)cbbly bedsof sands, which appear at the surface along the fringesof the London Basin, and arc known as the Reading I THE SCARPLANDS AND PLAINS 133 and Woolwich Sands. On the top of this
. A regional geography of the world, with diagrams and entirely new maps . the Wash. Its direction may be com-pared with that of the Warwick Avon. After havingpassed through the Goring Gap the main stream entersupon its lower course, which lies across the LondonBasin. Measures of three main kinds fill the trough formedin the great sheet of chalk which underlies the LondonBasin. Immediately above the chalk are [)cbbly bedsof sands, which appear at the surface along the fringesof the London Basin, and arc known as the Reading I THE SCARPLANDS AND PLAINS 133 and Woolwich Sands. On the top of this lies thegreat cap of London clay, whilst in several placeswhere the clay stands relatively hi^^h it is capped bysands (Bagshot Sands) younger than the clay. The mostextensive area of l^agshot Sands lies in the westernpart of the London Basin south of the Thames. FromAldershot it extends almost to Windsor. In otherplaces it is found in small patches, HampsteadHeath. A political map will show that the Thames forms acounty boundary throughout the greater part of its. iTui Ukttk C« . Ltd . Fig. 39.—The Fasin of the Thames. course, probably due to the fact that very early itbecame a boundary between those invaders who ap-proached the river from the north-east, and those wholanded on the south coast and then gradually pressedinland. That they did not take the natural line of^ntry, z. c. the river, was due to the strong fortress ofLondon which barred the way. Occupations of the Thames Basin. Naturally, the characteristics of the different kinds ofsoils are utilized by man and help to fix the leadingoccupations. The limestone and chalk ridges support 134 THE BRITISH ISLES large, flocks of sheep. Therefore we find many smallmanufacturing centres, e. g. Witney, west of Oxford,which has a blanket industry. In the Chilterns thepresence of considerable beds of clay and sand lyingon the chalk has given rise to the growth of smallwoods, in which the beech is largely found. This en-co
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectgeography, bookyear19
