Notes on the occurrence and composition of the nodular phosphates of South Carolina

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Abstract
THE belt of nodular phosphates appears to extend, more or less interrupted from the Wando and Cooper rivers, some fifteen to thirty miles above Charleston, in a south-southwesterly direction, parallel to the coast line, as far as St. Helena Sound and Bluffton, near Port Royal.As yet the precise area is unknown; no accurate survey having been made, although this want is daily felt by the community.It would be erroneous to suppose that there is a well defined stratum of any such extent as this area above mentioned; on the contrary, the bed appears only in patches, some of which, however, are many miles in diameter.On the Wando and Cooper rivers the nodules are found in comparatively small beds, generally but a few inches in thickness; still, limited deposits, one to three feet thick, have been reported in some localities of this neighborhood.On the peninsula between the Oooper and Ashley rivers, the deposit assumes the form of a well defined stratum, in many places attaining a thickness of eighteen to twenty-four inches, and underlying hundreds of acres, at au average depth of about three feet from the surface.The nodules vary in size from that of a walnut, to masses weighing two hundred pounds and over; they lie compactly together with but little marl between them.This marl is composed of 30 to 60 per cent carbonate of lime, a few per cent phosphates of iron, lime, and alumina,-the balance being chiefly sand and peroxyd of iron.At other points on the peninsula, the n~dules rarely exceed a few lbs. in weight, and are sparsely distributed.The favorable localities lie east of Goose creek, near the Oooper river.The Ashley beds were the first discovered, are the best known, largest in extent, and most mined.This deposit extends, at an accessible depth, over, perhaps, one thousand acres, on both sides of the river; and running back from it for several miles in some places.The beds are quite accessible, not only on account of the depth of the Ashley river and their proximity to Oharleston, but because of their lying close to the surface (generally within two feet) in a light soil which separates easily from the nodules on handling or washing.The nodules are of a yellowish-gray color, of less specific gravity than those elsewhere found, their surfaces but slightly irregular, and their composition tolerably uniform.The best beds lie on the river
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Authors C. U. Shepard
Journal american journal of science
Year 1869
DOI
10.2475/ajs.s2-47.141.354
URL
https://doi.org/10.2475/ajs.s2-47.141.354
Keywords Keywords not found

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