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IV.—On Faults in Strata

Published online by Cambridge University Press:  01 May 2009

Henry B. Medlicott
Henry B. Medlicott
Affiliation:
Geological Survey of India. 11, Hastings Street, Calcutta, 30July, 1870.
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Extract

Since I first saw my short notice on “Faults in Strata” in print (GeologicalMagazine, 1869, Vol. VI., p. 341), I have been anxious to remove a blemish of apparent flippancy in alluding to systems as applied to faults. I had indeed in view cases where that method had been used imitatively—with the tacit assumption of an established and well-understood meaning; but I lost sight of the fact that serious special work had been devoted to the subject, and my remark was unqualified. I have to thank my friend Mr. W. T. Blanford for an opportunity of making this correction, as well as of adding some further considerations on so important a point in the principles of stratigraphy.

Type
Original Articles
Information
Geological Magazine , Volume 7 , Issue 76 , October 1870 , pp. 473 - 482
Copyright
Copyright © Cambridge University Press 1870

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References

page 474 note 1 Hard Carboniferous Limestone surfaces may frequently be seen in the North of England and in Scotland; beautifully glaciated, but the glaciated surface has usually been protected by a covering of drift or vegetable soil. We should doubt their preservation on soft rock if exposed for long periods to the weather.—Edit. Geol. Mag.

page 480 note 1 These observations for Cornwall would seem to be very incomplete: in M. De Beaumont's recent work, already referred to, at p. 553, M. Moissenet gives a range of 60°, with a mean to E.N.E., for lodes of tin; a range of 60°, mean a little north of east, for copper lodes; and a range of 50°, mean a little west of north, for lodes of lead.

page 481 note 1 The possibility of widely discordant systems of fissures being produced by one and the same act of disturbance, as proved by Professor Haughton, seems completely to stultify such attempts as that of M. Moissenet to identify the fissures of a single locality with many distinct systems of the Réseau Pentagonal.

page 482 note 1 In Mr. Medlicott's former article on “Faults in Strata,” the following errata escaped correction (see Geol. Mag., vol. VI., 1869). Page 341, line 13 from commencement of article, for ‘experimental’ read experienced; second line from foot of same page, for ‘implicit’ read explicit. Page 342, line 21 from foot of page, for ‘having’ read leaving; line 20 from foot same page, for ‘instance’ read evidence. Page 343, line 3 from foot of page, for ‘lose’ read box (“box the compass”); last line same page, dele ‘such.’ Page 344, line 10 from top of page, for ‘marks’ read modes. Page 345, line 26 from foot of page, for ‘equivalents’ read equivalence; same page, line 7 from foot, for ‘run’ read seen; same page, line 5 from foot of page, for ‘their’ read thin. In justice to the ‘Reader,’ we beg to explain that the Author's MS. of this article (in 1869) was in a handwriting exceedingly difficult to read. It is always desirable that illegible articles should be recopied before they are sent to the printer, as it saves numerous errors. This is especially the case where the author, from his residence abroad, is unable to read and correct his own proof sheets.—Edit. Geol. Mag.