Publisher's Synopsis
Excerpt from Contributions to Lithology: I. Theoretical Notions; II. Classification and Nomenclature; III. On Some Eruptive Rocks; IV. Local Metamorphism
In a recent paper on The Chemical and Mineralogical Relation: of Metamorphic Rocks (silliman's Journal xxxvi, an: attempt was made to define the principles which have presided over the formation of sedimentary rocks, and to explain the nature and conditions of their alteration or metamorphism. That paper may be considered as to a certain extent introductory to the present one, which will contain, in the first part, some thsoss-r tical considerations which it is conceived should serve as a basis to lithological studies. In the second part will be given a few definitions which may serve to render more intelligible the clas sification and nomenclature of crystalline rocks; while a third part will contain the results of the chemical and mineralogical examination of some of the eruptive rocks of Canada; and a fourth, some examples of local metamorphism. The most of the results appear in the recent published Geology of Canada.
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