File:The American journal of science (1892) (18151476605).jpg

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Title: The American journal of science
Identifier: americanjourna3441892newh (find matches)
Year: 1880 (1880s)
Authors:
Subjects: Science
Publisher: New Haven : J. D. & E. S. Dana
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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490 G. H. Williams— Volcanic Hocks of South Mountain run) has any ferro-magnesian constituent as yet been detected. In this case biotite is abundant as an original mineral. The ground mass of the rhyolites is for the most part a quartz- feldspar mosaic of varying grain, much of which is the result of devitrification and recrystallization, though some of it is also probably original microgranite.
Text Appearing After Image:
Fig. 6.—Axiolitic and vesicular flow structures. No. 77 from near Snowy Mtn., mag. 5 diameters. Pig. 7.—Flow structure. No. 61, South of Willow Grove, Pa., mag. 5 diameters. Attention has been called by Tyson,* Huntf and Frazer^: to the beauty of the South Mountain porphyries, and to the fact that they are so susceptible of a high polish as to make them valuable for decorative purposes. Many of them closely resemble the famous porfido rosso antico of Egypt, which is largely used by the lapidaries of Rome. b) The basic rocks, basalts.—The basic lavas of South Mountain occupy an area about one-half as large as that cov- ered by the acid ones. They reach their maximum develop- ment near the State line, where, along the southern edge of Pennsylvania and for a considerable distance into Maryland, they form the entire width of the volcanic belt. North and south of this main body, the basic rocks or greenstones are everywhere met with as narrow bands intersecting the rhy- olites and following the general trend of the mountain. These bands differ much in their width, but seem to be most devel- oped along the eastern flanks of Green Ridge and Piney Mountain. * First Annual Eeport, 1860. Appendix, p. 3. f Proc. Am. Assoc. Adv. Science, 1876, p. 212 (compares them with the Elf- da) en porphyries). % Second G-eol. Survey of Penn., vol. CC, p. 285.

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Volume
InfoField
1892
Flickr tags
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  • bookid:americanjourna3441892newh
  • bookyear:1880
  • bookdecade:1880
  • bookcentury:1800
  • booksubject:Science
  • bookpublisher:New_Haven_J_D_E_S_Dana
  • bookcontributor:Smithsonian_Libraries
  • booksponsor:Biodiversity_Heritage_Library
  • bookleafnumber:528
  • bookcollection:biodiversity
  • BHL Collection
  • BHL Consortium
Flickr posted date
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27 May 2015
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