. Elements of agricultural chemistry and geology. Agricultural chemistry. 98 MILLSTONE GRIT. 600 feet or upwards in thick- It lies below the coal, but is sandstones and shales of the even, it is said, on the stiff whitish clays almost destitute of vegetable matter, which, as in Lanarkshire, occasionally occur on the surface of our coal-fields. 13. To the Millstone grit, of ness, the same remarks apply, often only a repetition of the coal measures, and forms in many cases soils still more worth- less. Where the sandstones prevail, large tracts lie naked, or bear a thin and stunted heath. Where
. Elements of agricultural chemistry and geology. Agricultural chemistry. 98 MILLSTONE GRIT. 600 feet or upwards in thick- It lies below the coal, but is sandstones and shales of the even, it is said, on the stiff whitish clays almost destitute of vegetable matter, which, as in Lanarkshire, occasionally occur on the surface of our coal-fields. 13. To the Millstone grit, of ness, the same remarks apply, often only a repetition of the coal measures, and forms in many cases soils still more worth- less. Where the sandstones prevail, large tracts lie naked, or bear a thin and stunted heath. Where the shales abound, the naturally difficult ^soils of the coal shales again recur. The rocks of this formation generally approach the surface, around the outskirts of our coal-fields. This arises from the circumstance that our coal measures often lie in basin-shaped deposits, from beneath each edge of which, the millstone grit and mountain limestone rocks rise up to the surface. This is illustrated by the annexed section, (No. 6,) across a part of Lancashire, in which 1 represents the coal measures ; 2 the coarse sandstones, &c. of the millstone grit; 3 a thick shale-bed, which often overlies the thick masses of mountain limestone represented by 4. Boulsworth hill. The traveller passes off the poor, often cold and wet, clay soils of the coal measures, on to the equally poor lands of the millstone grit, and over its top, as at Pendle hill, descends upon the sweet herbage and rich dairy pastures of the moun- tain limestone at 4. The section shows also how in this country the millstone grit. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Johnston, Jas. F. W. (James Finlay Weir), 1796-1855. New York, C. M. Saxton
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectagricul, bookyear1853
