254 T. 8. Hunt on Lithology. 
show the passage into eruptive rocks. Thus the crystalline 
able dykes among the adjacent broken siliceous strata, thus as- 
suming for small distances, the characters of an intrusive rock. 
For some figures and descriptions illustrating these broken and 
distorted strata, see Geology of Canada, pp. 27, 28. Wemay also 
allude in this connection to the observations of Dr. Hitch f° 
em 
inated, and bent around each other. (This Journal, [2], ¥¥™4 
372.) Hence, while the tendency of the various observations 
above cited is in favor of the indigenous character of many rocks 
hitherto regarded as eruptive, we have at the same time evidence 
that these rocks are occasionally displaced. We should not. 
therefore on a@ priori grounds reject the assertion that any ineta 
morphic sediment may sometimes occur in an exotic or intrusive 
fo: iven rock, like limestone or diorite, may occur 
as an indigenous and an exotic rock; and different port! 
the same mass may be seen by different observers under 
such 
ons of 
