THE CORRELATION OF FRACTURE SYSTEMS AND 
THE EVIDENCES OF PLANETARY DISLOCATIONS 
WITHIN THE EARTH’S CRUST. 
BY WILLIAM HERBERT HOBBS. 
In a recent paper tlie author lias attempted to correlate within 
a complex and varied geological province the somewhat 
scanty observations which deal with the orientation of fracture 
systems. 3 4 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 Phillips 2 and Ilaughton, 3 and later by Kinahan 1 for 
1 Lineaments of the Atlantic Border Region. Bull. Geol. Soc. Am., 
Vol. 15, Nov. 1904, pp. 483-506. Pis. 45-47. Read hy title before the 
International Geographical Congress at St. Louis, Sept., 1904. 
2 Phillips, John. Illustrations of the Geology of Yorkshire, Part 2. 
The Mountain Limestone District. London, 1836, pp. 90-98. Also, 
Manual of Geology, London, 1885 \(Etheridge and Seeley Edition), pp. 
33-34. 
sHaughton, 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. 
4 Kinahan, Gerald Henry. Valleys, their relations to fissures, fract¬ 
ures and faults. London, 1875, pp. xiv and 240. 
