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Skinner, Ernest B. (ed.) / Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume XV, Part I (1904)

Hobbs, William Herbert
The correlation of fracture systems and the evidences of planetary dislocations within the Earth's crust,   pp. [15]-29 PDF (4.7 MB)


Page [15]


THE CORRELATION OF FRACTURE SYSTEMS AND
   THE EVIDENCES OF PLANETARY DISLOCATIONS
             WITHIN THE EARTH'S CRUST.
               BY WILLIAM HERBERT HOBBS.
  In a recent paper the author has attempted to correlate within
a complex and varied geological province the somewhat
scanty observations which deal with the orientation of fracture
systems.' The results of this correlation possess considerable
significance inasmuch as there is a clear indication that over
quite an appreciable fraction of the earth's surface the main
lines of fracture betray evidences of a common origin. Since the
publication of the paper so many verifications of this conclusion
have come to the writer from geologists whose work- was unpub-
lished, or which apply to the extension of the province treated,
that it seems desirable to extend both the area considered and the
general topic in order to include the new material.
  That the fracture systems observed in a local district betray
close relationship to those of neighboring districts, was early
shown by Phillips2 and I1amghton,3 and later by Kinahant for
'Lineaments of the Atlantic Bordelr Region. Bull. Geol. Soc. Am.,
Vol. 15, Nov. 1904, pp. 483-506. Pls. 45-47. Read by title before the
International Geographical Congress at St. Louis, Sept., 1904.
2Phillips, John. Illustrations of the Geology of Yorkshire, Part 2.
The Mountain Limestone District. London, 1836, pp. 90-98. Also,
Manual of Geology, London, 1885 i(Etheridge and Seeley Edition), pp.
33-34.
3Haughton, Samuel. "On the physical structure of the old red sand-
stone of the County of Waterford, considered with relation to cleav-
age, joint surfaces and faults. Trans. Roy. Soc. Lond., Vol. 148, 1858,
pp. 133-348. Also, On the joint systems of Ireland and Cornwall and
their mechanical origin. Ibid, Vol. 154, 1864, pp. 383-411.
4Kinahan, Gerald Henry. Valleys, their relations to fissures, fract-
ures and faults. London, 1875, pp. xiv and 240.
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