La geologia di suoli e substrati, con particolare riferimento all'agricoltura, Estates, e igiene . g Medway Valley a salutando sopra Rochester,anche a Northfleet, grigi, ecc., e a Burgh Castle, westof Gorleston, nel Suffolk. Merlano è preparato anche inmany località. Alcuni dei più letti del Chalkhave sono state utilizzate per la costruzione di pietra, specialmente per insidework. La pietra di birra presso la base del centro di Chalk hasthus stato lavorato alla birra vicino a Seaton nel Devon. Itcontains 3 o 4 per cento di silice. Su circa il samehorizon Totternhoe la pietra è stata lavorata a letto- 260 GEOLOGIA DI 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.

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1910
• booksubjectgeology
• bookyear1912