Read online or download a free book: Rock Phosphates And Other Mineral Fertilisers: Their Origin, Value, And Sources Of Supply
Publisher: RareBooksClub.com (6 Mar. 2012)
By: Charles Chewings (Author)
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 Excerpt: ...the sea cliff, (5) the present fringing reef. The average height of the plateau is about 800ft. Along the raised rim of the plateau there are a number of hills: the highest (Murray Hill) is 1,170ft. The summit is formed of dolomitic limestone. Shelly limestone beds and beds of volcanic ejectamenta occur lower down. The dolomitic limestone shows traces of gasteropod shells. Over North-East Point is another elevation (Phosphate Hill), which, though not so high (900ft,), is particularly interesting on account of the extensive deposit of phosphate of lime which is found there. This substance is strewn over the surface in blocks of all sizes, and in some places it is found to a considerable depth: in others, however, it can be seen to rest directly on an irregular surface of dolomitic limestone, occasionally pinnacles of which project through it. At the northern edge of the hill the phosphate is found on both outer and inner slopes, but further south on the plateau side only, the outer being occupied by a reef of limestone, which descends to the terrace beneath in a low cliff. The atea actually covered by this thick deposit of phosphate of lime is about half a mile long by a quarter of a mile broad, but an immense quantity occurs in the form of irregular nodules and blocks scattered over ail the slopes and terraces of this part of the island. There are other less extensive deposit beds over Flying Fish Cove, and also at several points along the eastern edge of the plateau. Probably, when the islands were still low, and not covered with forest. as they are now, they formed the homes of myriads of sea birds, and the guano thus formed, after undergoing alteration mainly through loss of its organic matter, gave rise to the hard phosphatic rock now existing. At the s...
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