La géologie des sols et des substrats, avec référence spéciale à l'agriculture, des domaines, et l'assainissement . s sont les masses de Lincoln-shire du calcaire à grand ponton, et la masse de l'ensemble de marne200 yards à Beacon Hill, décrite par ProfessorJudd ; tandis que C. Fox Strangways a observé un ofLincolnshire * masse Oolite au moins 300 yards de long, et 100 yardsbroad, au nord-ouest de Melton Mowbray. Tous les theseoccur dans le cadre de l'argileux calcaire. Le mode de présence de la Boulder Clay est veryirregular. Il peut se produire dans de grandes feuilles de assez uniformcharacter sur de grandes superficies des terres dans

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The geology of soils and substrata, with special reference to agriculture, estates, and sanitation . s are the masses of Lincoln-shire Limestone at Great Ponton, and the mass of Marlstone200 yards across at Beacon Hill, described by ProfessorJudd; while C. Fox Strangways observed a * mass ofLincolnshire Oolite at least 300 yards long, and 100 yardsbroad, to the north-west of Melton Mowbray. All theseoccur in connection with the Chalky Boulder Clay. The mode of occurrence of the Boulder Clay is veryirregular. It may occur in great sheets of fairly uniformcharacter over large areas of upland in East Anglia, buthere and there it descends abruptly into the valleys. Thefact is that the pre-Glacial valleys, which became filledwith Glacial Drift, have been re-excavated in certainplaces, fortuitously, along the courses of the present river.* Proc. GcoL Assoc., 1894, xiii., p. 356. 23o GEOLOGY OF SOILS AND SUBSTRATA • At Glemsford, near Long Melford in Suffolk, a thicknessof 470 feet of Glacial Drift was thus proved, unexpectedly, in a well-boring ; in the Cam Valley, in Essex, a thickness 6. FIG. 24.—SECTIONS ALONG THE GREAT CENTRAL RAILWAY, EAST OFHILL FARM, RADSTONE, NORTHAMPTONSHIRE. Chalky Boulder Clay resting on Great Oolite. In this district much of the Great Oolite consists of a soft paleearthy limestone resembling Chalk, and in some places it was noteasy to mark any plane of junction between the Boulder Clay andthe weathered rubble of Great Oolite. At one point (C) there werestreaks of reddish-brown clay at the base of the grey Boulder Clay, and more or less parallel to the bedding of the Great Oolite below.A little farther south the Great Oolite was disturbed and nippedup (B). Again, farther south the Boulder Clay rested on a pipedsurface of the Great Oolite, the pipes being rilled in part withgreenish (estuarine) clay, in part with reddish-brown clay preciselylike that incorporated in thin strips in Section C. Here evidentlythe land-ice which accumulated the Bou

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• bookcentury1900
• bookdecade1910
• booksubjectgeology
• bookyear1912