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Published online by Cambridge University Press: 01 May 2009
The cause, or causes, which result in the foliation of igneous rocks is a subject which at present occupies the attention of many geologists, and seems likely, in the near future, to lead to some discussion. In view of this, a short account of the foliated granite of the Himalayas may be of interest. It may be as well, however, to preface my remarks by saying that I believe that foliation may be produced in several distinct ways, and the explanation which I offer of the mode in which the foliation of the Himalayan granite has been brought about is only intended to apply to the case of that granite.
In the following pages I propose to give a brief summary only of some of the more important results worked out in detail in a series of papers published in the Eecords of the Geological Survey of India; and to add thereto a brief consideration of the question whether the foliation of the gneissose-granite of the Himalayas
page 213 note 1 A geological map of the Dalhousie area and diagrammatic sections explaining it will be found at page 110, vol. xviii. Eecords Geol. Survey of India.
page 217 note 1 This is an awkward term; but, as it was introduced by Sorby, I retain it: microscopists know what it means.
page 218 note 1 I use this expression as a short term to indicate pressure applied after the consolidation of a rock, though, of course, I am aware that pressure so applied may produce heat and even fusion.
page 220 note 1 Quart Journ. Geol. Society, 1875, vol. xxxi. pp. 319–343.Google Scholar