The geology of soils and substrata, with special reference to agriculture, estates, and sanitation . , the deep vales or dales, excavated down to theLias, are also well cultivated where possible, or coveredby woodlands. LIAS. The Lias comprises a great series of clays and shales,with bands and nodules of limestone, and, locally, beds ofsand, sandstone, and ironstone. The strata appear at fr Jurassic Rocks of Britain, Mem. Geol. Surrey, 1892, i., p. 179. 304 GEOLOGY OF SOILS AND SUBSTRATA the surface over a broad belt of country between LymeRegis in Dorset and Redcar and Whitby i
The geology of soils and substrata, with special reference to agriculture, estates, and sanitation . , the deep vales or dales, excavated down to theLias, are also well cultivated where possible, or coveredby woodlands. LIAS. The Lias comprises a great series of clays and shales,with bands and nodules of limestone, and, locally, beds ofsand, sandstone, and ironstone. The strata appear at fr Jurassic Rocks of Britain, Mem. Geol. Surrey, 1892, i., p. 179. 304 GEOLOGY OF SOILS AND SUBSTRATA the surface over a broad belt of country between LymeRegis in Dorset and Redcar and Whitby in series is divided as follows : Upper Lias. Upper Lias. This formation consists of dark blue clays and shales,with nodules and bands of limestone. In Dorset andSomerset the higher beds consist of more or less sandy 3, Brown ochreous loamy clay, withlining of dark brown clay in hollowsof decalcified Upper Lias, 2 to 3 feet. 2, Pale earthy limestones and marls(Upper Lias), broken up and rubblyin the upper part, with marl at base,and numerous Ammonites, 7 —v— . T) Brown and blue iron-shot limestone, / /// J / // f // / j paler at top, and crowded in places i \ •, with Belemnites, etc. Marlstone (Middle Lias), 2 feet. FIG. 39.—QUARRY WEST OF NORTON-SUB-HAMDON, WEST OF YEOVIL. and micaceous shales, as well as blue clays, the formationbeing 70 feet thick in places. The basement-beds comprise pale, argillaceous lime-stones alternating with clays, and are about 6 feet or morein thickness. Near Yeovil the stone was formerly quarriedfor building-purposes. (See Fig. 39.) The Marlstonebelow is a harder and more durable rock. The thickness of the Upper Lias clay or shale has been SECONDARY FORMATIONS (JURASSIC) 305 estimated at 200 feet near Cheltenham, 120 feet atChipping Campden, 60 feet at Bloxham, 82 feet atBurford, 153 feet at Northampton, and 190 feet at Duston. Along the borders of the Cotteswold Hills the slopesof Upper Lias are m
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectgeology, bookyear1912
