. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. SKEATS : CHEMICAL COMPOSITION OF LIMESTONES. 75 limits of variation in the amount of magnesium carbonate are very small, the minimum value being and the maximum per cent. In- soluble residue and calcium phosphate are present only in very minute quantities. NGILLANGILLAH. 475 p^; 400 300 Height. Calcium Carbonate. Magnesium Carbonate. Insoluble Residue. Calcium Phosphate. 475' .02 — 406' — — 365' — — 305' — — 250' — — 215' — — 200'
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. SKEATS : CHEMICAL COMPOSITION OF LIMESTONES. 75 limits of variation in the amount of magnesium carbonate are very small, the minimum value being and the maximum per cent. In- soluble residue and calcium phosphate are present only in very minute quantities. NGILLANGILLAH. 475 p^; 400 300 Height. Calcium Carbonate. Magnesium Carbonate. Insoluble Residue. Calcium Phosphate. 475' .02 — 406' — — 365' — — 305' — — 250' — — 215' — — 200' — — 175' — U(Y — .064 127' — — 120' — — 100' 63 4 — — 90' — — 55' .07 — 46' — — 25' — — 6' — — 100 -. Microscopical. 475'. — The appearance of the section suggests that the rock was a fragmental limestone made up of Lithothamnion and other organisms, largely cemented by an incrusting deposit of radiating crystals of calcite. Subsecpuently the rook has been dolomitized. In some parts of the rock the matrix was originally " mud," some of which has since altered to more or less clear granular dolomite. 215'. A dolomitio limestone, in which the only recognizable organ- isms are Amphistegina, altered Lithothamnion, and " ghosts " of corals, now represented by infillings of " mud " between the septa of the vanished. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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Keywords: ., bookauthorha, bookcentury1800, bookdecade1860, booksubjectzoology
