The geology of soils and substrata, with special reference to agriculture, estates, and sanitation . FIG. 25.—SECTIOX AT CHALK-PIT, CLAYDOX, SUFFOLK. 4, Soil and decalcified Boulder Clay. 3, Chalky Boulder Clay. 2, Sands and gravels (Crag Series) disturbed. i, Chalk. Total thickness, about 30 feet. Elsewhere marked contortions of underlying strata arenot uncommonly met with where brickearth or clay, orthin alternations of clay and sand, occur beneath BoulderClay. (Fig. 26.) Sometimes there is evidence of erosion ofthe underlying clays or Glacial muds, where no contortionwas to be seen, as in F
The geology of soils and substrata, with special reference to agriculture, estates, and sanitation . FIG. 25.—SECTIOX AT CHALK-PIT, CLAYDOX, SUFFOLK. 4, Soil and decalcified Boulder Clay. 3, Chalky Boulder Clay. 2, Sands and gravels (Crag Series) disturbed. i, Chalk. Total thickness, about 30 feet. Elsewhere marked contortions of underlying strata arenot uncommonly met with where brickearth or clay, orthin alternations of clay and sand, occur beneath BoulderClay. (Fig. 26.) Sometimes there is evidence of erosion ofthe underlying clays or Glacial muds, where no contortionwas to be seen, as in Fig. 27. The Chalky Boulder Clay becomes decalcified at thesurface in irregular cavities, being piped like the Chalk.(See Fig. 27.) In deep ploughing the unweathered chalky * H. B. Woodward, Geol. Mag., 1897, p. 494 ; see also Whitaker,Geology of Stowmarket, Mem. Gcol. Survey, 1881, p. 10. 232 GEOLOGY OF SOILS AND SUBSTRATA. FIG. 26.—SECTION ABOUT ONE MILE SOUTH OF SURLIXGHAMST. MARY, NEAR NORWICH.* 2, Chalky Boulder Clay, mostly decalcified. Brown stony loam with unweathered remnants of Chalky Boulder Clay, 3 , Blue clay and laminated clay and sand, contorted, 5 feet.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectgeology, bookyear1912
