478 A. F. BUDDINGTON 



impress one with the idea that a basaltic magma was the one from 

 which the salic differentiates originated. 



CONCLUSION 



The points brought out in this paper which it is desired to 

 emphasize are as follows: 



1 . The confirmation of the local glaciation of the Avalon Penin- 

 sula, of the control of faults and fractures over the lineaments of the 

 topography, and of the fiord nature of the coast. 



2. The description and confirmation of the presence of a thick 

 series of volcanics at the base of the pre-Cambrian section. 



3. The presentation of evidence pointing toward the origin of 

 the members of the later pre-Cambrian series, as follows : 



a) The Avondale volcanics as subaerial accumulations of vol- 

 canic materials derived from volcanoes of the central type. 



h) The Conception slate series as materials derived from rocks 

 resembling the Avondale volcanics swept into the sea in a com- 

 paratively fresh, unaltered condition. 



c) The Momable formation as well-decomposed marine sedi- 

 ments with traces of organic life. 



d) The Signal Hill reddish-brown sandstone series as dominantly 

 subaerial fiuviatile deposits in a subarid climate, derived from a 

 re-working of volcanic rocks resembling members of the Avondale 

 volcanics. 



4. The evidence of a comagmatic series of igneous rocks intruded 

 probably at some time during early or middle Proterozoic time. 



5. The entire series from bottom to top is derived directly or 

 indirectly from rocks of volcanic origin. 



The author wishes to acknowledge his indebtedness to Professors 

 van Ingen and Smyth for their cordial assistance and advice 

 rendered to him throughout the course of the work, and to Mr. B. F. 

 Howell for his assistance during the summer of 19 13. 



