. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 116 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. containing small fragments of organisms. Subsequently, dolomite crystals were deposited on the coral walls which can now be traced by a dirt line. The substance of the coral has been broken down, and its place is now taken by a fine gray dolomitic "silt," in which larger crystals of dolomite have formed. On applying Lemberg's test to a thin section of this rock, it is found that, in spite of dolomitization, most of the " mud " in the slide becom
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 116 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. containing small fragments of organisms. Subsequently, dolomite crystals were deposited on the coral walls which can now be traced by a dirt line. The substance of the coral has been broken down, and its place is now taken by a fine gray dolomitic "silt," in which larger crystals of dolomite have formed. On applying Lemberg's test to a thin section of this rock, it is found that, in spite of dolomitization, most of the " mud " in the slide becomes stained, showing that it still consists of a finely divided Fig. 9. Mango, 290 feet. A much altered cavernous dolomite, whose cavities are now nearly filled with large crystals of secondary calcite. X 30. After the complete dolomitization of a rock, it is noticed that cavities are often filled or partly filled by the further deposition of crystals apparently from solution. This deposited material consists sometimes of dolomite, in which case the composition of the rock is not much changed ; in most cases, however, the material deposited consists of broad crystals of calcite. Figure 9 illustrates this point, and represents a section of a fragmental limestone from Mango at a height of 290 feet. The figure shows that the limestone has been thoroughly dolomitized, and as a consequence the organisms are largely obliterated, while cracks and cavities have arisen in. 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
