File:The Quarterly journal of the Geological Society of London (1898) (14592627469).jpg

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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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e rocks there. The felspars are lath-shaped; theferromagnesian constituent is much altered. Above this is a red rock (202). The slices show 1 hat it is a fine-grained tuff. Eastward and above this is a green rock (168). Oneach side of the Reservoir appeared a very distinct bed of black clay.The microscopic section of the rock shows that it is a basalt.There is a large development of chlorite replacing augite. During the excavation it was interesting to note two conspicuousrocks, one green (168), and the other red (117 «, 170), side by side.The latter belongs to the bed next above. This bed is at thebottom a fine-grained tuff, and has almost the appearance of havingbeen sorted by or deposited in water. Higher in this bed is acoarse-grained tuff (210, 244, 260). There are in it fine felspar- 1 Quart. Journ. Geol. Soc. vol xliii (1887) p. 499. ^ The numbers iu parentheses refer to the slides in my cabinet. Fig. 1.—Sketch-maj) of the Herefordshire Beacon and its immediate surroundings.
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lOOO 590 1000 Scale of Feet 2000 I Vol. 54.) A VOLCANIC SERIES IN THE MALVERN HILLS. 559 crystals and fragments of basic rock. A remarkable feature of thistuff is that the matrix is isotropic. Next to the eastward is a fine-grained rock, very much shattered,and having its cracks filled up with calcite. In some places thereis a high percentage of carbonate of lime (in one instance 38*57per cent., and in another 56 per cent.). The rock is, however,undoubtedly a felsite, and at some points (that is, around the filter-beds) is of so glassy a nature as evidently to be a devitrifiedobsidian (48, 49, 205). The dip at this point becomes nearlyvertical. This type of rock is constantly repeated with more or lesscalcite, generally less, the farther east the specimens are obtained. A fine-grained dyke (176) cuts across the southern end of thisseries of rocks, striking a little south of west. It is very similarin appearance to an elvan, and can be found again some way upthe flank of Broad Down. We

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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:671
  • bookcollection:biodiversity
  • BHL Collection
  • BHL Consortium
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29 July 2014
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