Guide books of excursions in Canada1-10 . razy mountain,Montana (Wolff, Bull. , 148, p. 144, 1897). No. 8. Normal essexite—Mount Johnson, Quebec(Adams, Jour, of Geol., April-May, 1903.) In connection with this alteration of limestone toamphibolite it is to be noted that the change is not one ofsolution or digestion of the limestone by the granite, forthe fragments preserve their sharp and well-defined formseven when the alteration is complete. The limestone, at a distance from the granite, is awhite crystalline marble, containing scarcely any impuritiesand effervescing freely in fragme
Guide books of excursions in Canada1-10 . razy mountain,Montana (Wolff, Bull. , 148, p. 144, 1897). No. 8. Normal essexite—Mount Johnson, Quebec(Adams, Jour, of Geol., April-May, 1903.) In connection with this alteration of limestone toamphibolite it is to be noted that the change is not one ofsolution or digestion of the limestone by the granite, forthe fragments preserve their sharp and well-defined formseven when the alteration is complete. The limestone, at a distance from the granite, is awhite crystalline marble, containing scarcely any impuritiesand effervescing freely in fragments with cold dilutehydrochloric acid, showing that it is an essentially purecarbonate of lime. 72 The changes are the result of the transfusion into thelimestone of certain constituents which are present in thegranite magma. A remarkable fact in connection with thealteration, is that the granite, which is an acid variety ofthe rock containing a very small amount of biotite as itsonly bisilicate, where the limestone was bathed by it or. Amphibolite resulting from alteration of limestone, cut by Glamorgan batholith near Bear lake. Eastern border actually immersed in it as in the case of the included frag-ments, has notwithstanding this fact transfused into thelimestone not only silica, alumina and alkalis, as might beexpected, but also large amounts of magnesia and limestone evidently fixed certain constituents of thegranite magma in relatively greater abundance than others,exerting a species of selective action. In the cutting just west of Maxwells Crossing thereis an exposure of a coarse pegmatite rather rich in ferro •magnesian constituents, holding an inclusion of limestone Ge.
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