1895.] NEW YORK ACADEMY OF SCIENCES. 189 
10. Report on the Geology of Southern New Brunswick, embracing the 
counties of Charlotte, Sunbury, Queens, Kings, St. John and Albert, by L. 
W. Bailey, G. F. Matthew and R. W. Ells. Can. Geol. Sur. Rep. 1878-9, p. 
1-26 D. 
11. On the Progress of Geological Investigation in New Brunswick 1870- . 
1880, by L. W. Bailey. Proc. Am. Ass. Adv. Sci. 1880, p. 415. 
12. On the Progress of Geological Investigation in New Brunswick. Trans. 
Roy. Soc. Can. 1889, VII., Sec. 4, 3-17. 
13. Cambrian Organisms in Acadia, by G. F. Matthew in Trans. Roy. Soe. 
Can. 1889, Sec. 4, p. 135. 
14. Correlation Papers, Archzan and Algonkian, by C. R. Van Hise. U. 
S. Geol. Sur. Bull. 86. 1892. 
15. Matthew, W. D., Intrusive Rocks near St. John, N. B. Trans. N. Y. 
Ac. Sei. XITT., 185. 1894. 
16. Outlets of the St. John River, by G. F. Matthew. Nat. Hist. Soc. 
New Bruns. Bull. XII., 1895. 
The present paper is a continuation of a petrographic study 
of the igneous rocks near St. John, N. B. The intrusive rocks 
in the immediate neighborhood of the city have already been 
discussed ;* it remains to describe the surface volcanics and 
dykes, and to add some notes as to the further extension of the 
intrusives. 
Pre-Cambrian volcanic rocks are known to exist at various 
points along the flanks of the metamorphic belt of eastern North 
America. Although more or less clearly recognized as such in 
many of the earlier surveys, their certain determinations could 
usually be made only by the aid of thin sections, and accord- 
ingly it is only within the last few years that their exact char- 
acter has been definitely known. The late Dr. Geo. H. Williams, 
in an article in the Journal of Geology,; has called attention to 
their wide distribution and importance, and to their close re- 
semblance to modern effusives, except where altered by meta- 
morphism. Dr. Williams gives a very full and complete sum- 
mary of their occurrence in Newfoundland, Nova Scotia and 
New Brunswick, the eastern townships of Quebec, in Maine, 
New Hampshire and eastern Massachusetts, in the South Moun- 
tain of Pennsylvania and Maryland, and along the Blue Ridge 
as far south as Georgia. There is, however, a great dearth of 
petrographic descriptions of these rocks, most of the determina- 
tion having been made in the field only. Besides the well known 
* Trans. N. Y. Acad. Sci. XIITI., 185. 
+ Jour. Geol. IT., 1. 
