File:Bulletin of the Geological Society of America (1917) (20261256908).jpg

Title: Bulletin of the Geological Society of America
Identifier: bulletinofgeol281917geol (find matches)
Year: 1890 (1890s)
Authors: Geological Society of America
Subjects: Geology
Publisher: (New York : The Society)
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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Text Appearing Before Image:
254 H. S. WASHINGTON PERSISTENCE OF VENTS AT STROMBOLI dance of smoke, have sometimes rendered the exact relative location of the vents somewhat difficult, if not impossible. It is here that the pres- ence of the eastern and western bounding ridges proves to l^e invaluable for orientation. On the other hand, the plans and sketches were made b)^ different observers, and independently of any theory of persist- ence in location of the vents for any great length of time. As the number of illustrations is somewhat large, considerations of space necessitate a very brief discussion of each and comparison with its successor, the one pre- viously described, it being understood that the figures are presented in an inverse chronological order. This order is adopted because the more 0& \^ © Of Figure 3,—Plan of the Crater Terrace of StromhoU, August, 1912 (Ferret)
Text Appearing After Image:
Figure 4.—Plan of Crater Terrace of Stromholi, May, 1906 (M'egner) modern plans are not only more reliable, but present the situations of the vents more clearly than the earlier views, which often leave something to be desired in these respects and can only be regarded as confirmatory of the evidence furnished bv the later illustrations.

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