. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. tertiary strata, 6, are more fully developed than elsewhere. As, however, the surface of h is thereusually more coincident with the valley level, V, L, of the district, it is in a better positionfor retaining more of the rainfall. A third position of outcrop, much more unfavourable for the water-bearing strata, prevailsgenerally along the greater part of the northern boundary of the tertiary strata. Instead offorming a valley, or outcropping at the base of the chalk hills, almost the whole length of this o
. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. tertiary strata, 6, are more fully developed than elsewhere. As, however, the surface of h is thereusually more coincident with the valley level, V, L, of the district, it is in a better positionfor retaining more of the rainfall. A third position of outcrop, much more unfavourable for the water-bearing strata, prevailsgenerally along the greater part of the northern boundary of the tertiary strata. Instead offorming a valley, or outcropping at the base of the chalk hills, almost the whole length of this out-crop lies on the slope of the hills, as in Fig. 1501, where the chalk c forms the base of the hill andthe lower ground at its foot, whilst the London clay, a, caps the summit, thus restricting the out-crop of 6 to a very narrow zone and a sloping surface. This form of structure is exhibited in thehills round Sonning, Eeading, Hedgerley, Rickmansworth, and Watford; thence by Shenley Hill,Hatfield, Hertford, Sudbury ; and also at Hadleigh this position of outcrop is continued. If, a
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
