Die Geologie der Böden und Substrate, mit besonderem Bezug auf die Landwirtschaft, Fincas und sanitären Einrichtungen. g Der Medway Tal bei Hageln über Rochester, auch bei Northfleet, Grau, etc., und auf Burgh Castle, westof Gorleston, in Suffolk. Wittling ist auch schon in vielen Gemeinden vorbereitet. Einige der härtere Betten der Chalkhave für Gebäude - Stein verwendet wurden, vor allem für insidework. Das Bier Stein auf der Basis der mittleren Kreide hasthus an Bier in der Nähe von Seaton in Devon gearbeitet. Itcontains 3 oder 4 Prozent, Kieselsäure. Über die Totternhoe samehorizon der Stein im Bett gearbeitet worden ist - 260 GEOLOGIE VON S

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The geology of soils and substrata, with special reference to agriculture, estates, and sanitation . g the Medway Valley at Hailing above Rochester, also at Northfleet, Grays, etc., and at Burgh Castle, westof Gorleston, in Suffolk. Whiting is also prepared inmany localities. Some of the harder beds of the Chalkhave been utilized for building-stone, especially for insidework. The Beer Stone at the base of the Middle Chalk hasthus been worked at Beer near Seaton in Devon. Itcontains 3 or 4 per cent, of silica. On about the samehorizon the Totternhoe Stone has been worked in Bed- 260 GEOLOGY OF SOILS AND SUBSTRATA fordshire, also at Burwell and Reach in Cambridgeshire, where it has locally been termed Clunch. In WestNorfolk, at Marham, building-stone has been obtainedfrom hard beds in the Lower Chalk. Near Norwich many old workings with galleries havebeen found in the Chalk, made for the purpose of extract-ing Chalk or fresh flints. One of these was found in 1823, near St. Giless Gate, and comprised various galleries about8 feet in height, from 2 to 5 feet in breadth, and occupying IffSff. FIG. 33.—SECTION NEAR KXIGHTOX MILL, MERSLEY Dowx, EAST OFNEWPORT, ISLE OF WIGHT. (A. Tylor .*) The section shows highly-inclined Chalk with bands of nodular flintoverlain by gravel. By dissolution of the Chalk an irregularpiped surface with beaklike projections has been produced ona previously eroded surface of the Chalk. a total length of 4, 600 feet. It is believed that the objectof this particular working was to extract the flints whichwere used in great quantity in the construction of theancient buildings and walls of Norwich. t Similar galleriesfor the extraction of Chalk have been made in old timesat Chislehurst, and there also are vertical shafts, some of * Quart. Joitrn. Geol. Soc., 1869, vol. xxv., p. 97.t H. B. Woodward, Geology of Norwich, Mem. Geol. Surrey, 1881, p. 29. SECONDARY FORMATIONS (CRETACEOUS) 261 which were probably dene-holes, others ordinary wells.(See p. 165.

Stockbilder mithilfe von Tags suchen

• bookcentury1900
• bookdecade1910
• booksubjectgeology
• bookyear1912