28 Canadian Becord of Bcience. 



presence of certain of these minerals in this class of rocks- 

 Scapolite has repeatedly been recorded in metamorphic 

 zones in limestones cut by granite and other igneous rocks. 1 

 Several workers in the limestones of the Adirondacks 

 have mentioned their great similarity to those of the 

 Grenville Series of Canada, 2 and Van Hise goes so far as 

 to suggest that they are identical. Now in these lime- 

 stones of New York occur very analogous intrusions of 

 igneous rocks, and the result are contact zones similar in 

 nearly every respect to those under consideration here. 

 Smyth 3 has remarked upon the presence of scapolite as a 

 characteristic mineral in these zones, and Kemp says : 4 

 " Contact masses of silicates similar to those above de- 

 scribed (scapolite, sphene, hornblende, augite, etc.) are 

 characteristic of not a few exposures of white crystalline 

 limestone in this eastern part of the United States, and 

 always near them the igneous intrusions are found. 

 Scapolite is especially characteristic of such, and in- 

 variably with it are hornblende, pyroxene, and titanite." 

 And he continues : " In many places the contact effect of 

 these intrusions on limestones are so similar 5 that one is 

 inclined to suspect the near presence of igneous rocks 

 wherever these contact minerals, and especially scapolite, 

 are reported in limestones." 



1. Adams, F. D. and Lawson, A. C, "Some Canadian Rocks containing Scapolite," 

 Can. Rec. Sci., 1888, Vol. III., p. 201. 



Nason, F. L., Ann. Rep't. State Geologist of New Jersey, 1890, pp. 32-33. 



Kemp, J. F., Trans. N.Y. Acad. Sci., 1893, Vol. XII., p. 74. 



Zirkel, F., "Beitrage zur Kenntniss der Pyrenaen," Zeit. d. d. geol. Ges., 1876, 

 Vol. XIX., p. 68 et seq. 



Lacroix, A., " Description des Syenites nepheliniques de Pouzac, etc.," Bull. Geol. 

 Soc. de France, 1890, p. 511. 



" Contributions a l'etude des gneiss a pyroxene et des roches a wernerite," Bull. 

 Soc. Franc, de Min., 18S9, Vol. XII. 



Frossard, C. L., " Sur les Roches metamorphiques de Pouzac etc." Comptes Rendus, 

 1890, Vol. CX., p. 1013. 



2. Kemp, J. F., " Gabbros on the Western Shore of Lake Champlain," Bull. Geol. Soc. 

 Am. 1893, Vol. V., p. 214. 



"Crystalline Limestones of the Eastern Adirondacks," loc. cit. Van Hise, C. R., 

 " Correlation Papers, Archaean and Algonkian," Bull. U.S.G.S., No. 86, p. 508. 

 Smyth C. H., jr., loc. Cit., p. 266. 



3. loc. cit., p. 279. 



4. " Gabbros of Lake Champlain," loc. cit., pp. 223-224 



5. The italics are the present writers. 



