. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. SKEATS : CHEMICAL COMPOSITION OF LIMESTONES. 97 which have been analyzed. It is possible that both these rocks may be derived from the older dolomitic limestones occurring in the cliff above. The remainder of the analyses in this section are those of lime- stones, in which the amount of magnesium carbonate does not rise above 4 per cent. Number. Height. Calcium Carbonate. Magnesium Carbonate. Insoluble Residue. 617 GOV — 618 600' — 619 570' — 620 540' — 621 510' 3.
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. SKEATS : CHEMICAL COMPOSITION OF LIMESTONES. 97 which have been analyzed. It is possible that both these rocks may be derived from the older dolomitic limestones occurring in the cliff above. The remainder of the analyses in this section are those of lime- stones, in which the amount of magnesium carbonate does not rise above 4 per cent. Number. Height. Calcium Carbonate. Magnesium Carbonate. Insoluble Residue. 617 GOV — 618 600' — 619 570' — 620 540' — 621 510' — 622 480' — 623 450' — 624 420' — 625 390' .024 626 360' — 627 320' — SOUTH-EAST OF PHOSPHATE HILL. Second Inland Microscopical. No. 618. — A cavernous rock, containing hollow casts of Amphistegina. The only recognizable organism is a much altered Lithothamnion. The matrix consists chiefly of clear rhombohedral crystals of dolomite, a few of which show zoning by included material. No. 619. This appears to be a rubble rock. Small fragments of what looks like a dolomitic limestone are mixed with other darker lime- stone fragments. One small rounded augite is present, while in one of the fragments a piece of coral occurs, having its organic structure well preserved. No. 623. A very close-grained compact limestone, containing a few rhombohedral crystals. Very few recognizable organisms are present in this rock. West White Beach. — This fringing reef forms a shallow cliff be- tween the levels of 500 and 400 feet at West White Beach, about a mile northwest of Murray 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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