File:The Quarterly journal of the Geological Society of London (1898) (14776810574).jpg

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Description
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Identifier: quarterlyjourna541898geol (find matches)
Title: The Quarterly journal of the Geological Society of London
Year: 1845 (1840s)
Authors: Geological Society of London
Subjects: Geology
Publisher: London (etc.)
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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still quite sharp and angular, lying for the most part with theirlonger axes parallel to the foliation ; but some of them have appa-rently been converted into granular mosaic. A few of them tail offin one direction into mosaic, as if the thinner end of the fragmenthad yielded to the heat, while the main part of it had resisted.Minute particles of quartz surrounded by matrix are still angular. Vol. 54.) GEITS AND SHALES IN NORTHERN ANGLESEY. 379 No. 448.—Alteration greater, and schistosity more stronglymarked. Contortion very intense, some of the micaceous folia beingtwisted and sheared again and again within the length of ^ inch.The quartz-seams are perfectly granular. Some of them extendacross the slide, others form short lenticles. There are no largefragments in this specimen. The folia between the quartzose seamsare highly micaceous and chloritic, and embedded in them arenumerous minute bits of quartz, many of wbich are perfectlyangular. Pig. 2,—Schist from Pant-y-Glo (No. U8).
Text Appearing After Image:
X 45. (Alteration more advanced. A folium of chlorite, white mica, and clasticquartz is seen to intervene between two folia of quartz-mosaic) No. 447.— Similar, but more micaceous. The minute quartz-fragments are much less abundant, but still quite evident. (Seefig. 3, p. 380.) It is possible that the granular quartzose aggregates in theseslides contain some felspar, but the minuteness of the particlesrenders the application of optical tests extremely difficult. Hardlyany fragmental felspar appears in the more schistose varieties. I am not prepared to offer a complete theory on the genesis of themetamorphism. In a generalway, itis true that the alterationhas proceeded pari j)assu with the pressure. The most highly-metamorphosed varieties of schist are contorted on both the large 380 DE. C. CALLiWAY ON THE METAMORPHISM OF (Aug. 1898, and on the small scale, and sheared on the minute scale. Yet, onthe other hand, one of the slides (450) ^ from the Pant-y-Glo sectionis hardly compresse

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Volume
InfoField
1898
Flickr tags
InfoField
  • bookid:quarterlyjourna541898geol
  • bookyear:1845
  • bookdecade:1840
  • bookcentury:1800
  • bookauthor:Geological_Society_of_London
  • booksubject:Geology
  • bookpublisher:London__etc__
  • bookcontributor:Smithsonian_Libraries
  • booksponsor:Biodiversity_Heritage_Library
  • bookleafnumber:476
  • bookcollection:biodiversity
  • BHL Collection
  • BHL Consortium
Flickr posted date
InfoField
29 July 2014

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