File:Bulletin of the Museum of Comparative Zoology at Harvard College (1863) (20488479625).jpg

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Title: Bulletin of the Museum of Comparative Zoology at Harvard College
Identifier: bulletinofmuseu41harv (find matches)
Year: 1863 (1860s)
Authors: Harvard University. Museum of Comparative Zoology
Subjects: Zoology; Zoology
Publisher: Cambridge, Mass. : The Museum
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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110 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. stable form calcite has resulted either in the gradual conversion of the aragonito organisms into granular calcite without loss of the external boundaries, or, as frequently happens, this change is attended by the complete disintegration and obliteration of the organisms. Figure 4 is in illustration of the first alternative. It is a transverse section of a reef-forming coral from the third terrace of Makatea, and shows a coral whose cavity was originally filled with " mud." The stereoplasm has been replaced by a mosaic of almost clear
Text Appearing After Image:
Fig. 5. Mango, 370 feet. A fragmental limestone partially recrystallized. Most of the matrix is " mud," but some has changed to calcite. Calcite organisms, such as Lithothamnion and echinid spines, remain unaltered; but aragonite organisms are represented by clear calcite and dirt lines round their external boundaries. X 30. calcite. The external wall of the coral can now be traced only by a thin dirt line, which possibly represents the impurities and organic matter ex- truded during the process of recrystallization. This must often be a very gradual process, because the tubes of boring alga? which are commonly found traversing the substance of the coral are occasionally preserved after recrystallization. It will be noticed that the " mud " within the coral cavity has shared in the recrystallization, and now consists of a mosaic of muddy crystals. The form of these crystals is

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Volume
InfoField
41-42
Flickr tags
InfoField
  • bookid:bulletinofmuseu41harv
  • bookyear:1863
  • bookdecade:1860
  • bookcentury:1800
  • bookauthor:Harvard_University_Museum_of_Comparative_Zoology
  • booksubject:Zoology
  • bookpublisher:Cambridge_Mass_The_Museum
  • bookcontributor:Gerstein_University_of_Toronto
  • booksponsor:University_of_Toronto
  • bookleafnumber:470
  • bookcollection:gerstein
  • bookcollection:toronto
  • bookcollection:medicalheritagelibrary
  • BHL Collection
Flickr posted date
InfoField
11 August 2015


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