A PRE-TERTIARY NEPHELINE- BEARING ROCK 165 
to Ohio from a northern source, and is, like all the igneous drift 
material, of Cambrian or, more probably, pre-Cambrian ote, Ue 
nepheline-syenite has been described by Dr. Adams? from 
southern Canada. A type related to the nepheline-basanite, Dr. 
Adams says, is known in Canada, in the vicinity of Montreal, 
where it forms dikes connected with the intrusive stock of Mt. 
Royal. There is no reason why a similar rock should not occur 
west of Montreal, and it may yet be described. It is impossible 
to say at present whether this nepheline-bearing rock is in any way 
related to these formations or is related as a dyke to some yet 
undescribed nepheline-syenite area on the north shore of Lake 
Huron. In any case it is a pre-Tertiary dike or surface, vol- 
canic, resembling the modern type and thus affording another 
instance of the essential similarity of ancient and modern rock 
types. F. Bascom. 
BRYN MAWR COLLEGE. 
*F. D. ADAMs, on the occurrence of a large area of nepheline-syenite in the 
township of Dungannon, Ontario, Am. Jour. Sci., 198, pp. 10-18. 
