The geology of soils and substrata, with special reference to agriculture, estates, and sanitation . 176 GEOLOGY OF SOILS AND SUBSTRATA on the other hand, has seen no lynchets in Dorset thatpossess any retaining wall. Near Portesham he observedsome remarkably flat ledges, now in pasture, that cor-respond with alternate beds of nodular rock and PortlandSand. The formation of terraces was thus favoured, andtheir outer edges, where the soil has accumulated, indicatea former FIG. 12.—HILL NORTH OF BOTHEXHAMPTOX, DORSET. In this rough sketch the higher grounds, formed of Inferior Ooli
The geology of soils and substrata, with special reference to agriculture, estates, and sanitation . 176 GEOLOGY OF SOILS AND SUBSTRATA on the other hand, has seen no lynchets in Dorset thatpossess any retaining wall. Near Portesham he observedsome remarkably flat ledges, now in pasture, that cor-respond with alternate beds of nodular rock and PortlandSand. The formation of terraces was thus favoured, andtheir outer edges, where the soil has accumulated, indicatea former FIG. 12.—HILL NORTH OF BOTHEXHAMPTOX, DORSET. In this rough sketch the higher grounds, formed of Inferior Oolite,were early under cultivation, as indicated by lynchets (A) ; onthe lower slopes hedgerows are growing on the underlyingMidford (or Bridport) Sands ; these conform to a certain extentwith the lynchets, and might indeed give rise to terraces if thehedges were removed. Artificial terraces, somewhat resembling lynchets, werepointed out to the writer in the Stroud Valley byj. , who stated that they were used in old times asracks for drying cloth. DISPOSAL OF WASTE-WATER, FARM-DRAINAGE, AND REFUSE. Dumb-wells (absorbing or blind wells) and percolatingcess-pits for waste-water and house-drainage must notbe constructed in situations where the water-supply ofthe area is liable to be affected, least of all where theunderground strata are rocky and fissured. It should be borne in mind that when injury is done to DISPOSAL OF WASTE-WATER, ETC. 177 neighbours or neighbouring w
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectgeology, bookyear1912
