200 REPORT. ON CORRELATION 
crystalline limestone, the calcareous amphibolite, and the pink felsites 
were in a condition to yield fragments, that such fragments were well 
rounded by water action, and that these formations were the chief 
sources of material for the conglomerate. It therefore follows that 
there is an important local break between the conglomerate and the 
underlying formations. However, the district is one in which con- 
temporaneous volcanic action occurred, and when the conglomerate 
is traced along the strike it appears to contain volcanic clastic material. 
The question therefore arises whether this conglomerate marks a 
general uncomformity in the sedimentary series for the district or 
is a local unconformity. This question can be finally decided only 
when the Madoc district is mapped in detail. 
The committee then went to Deloro, which lies about seven miles 
to the west of the village of Madoc. In this vicinity they found a 
large mass of granite, constituting what is locally termed the ‘“Huckle- 
berry Rocks,” penetrating a series of highly altered impure crystal- 
line limestones and developing in the latter a great variety of silicates 
in the form of irregular bands and masses. 
A short distance to the north of the village of Deloro the granite 
was found cutting a dark amphibolite, of which it inclosed an immense 
number of angular fragments which in places presented distinct 
- evidence of being absorbed by the granite mass. It was not quite 
clear whether this process of absorption was produced by the complete 
solution of the amphibolite in the granite and the subsequent re- 
crystallization of the resulting mass, or whether the intermediate 
rock had resulted from a very complete penetration of the intruded 
amphibolite by granitic material. According to Mr. Coste, the 
amphibolite in question results from the alteration of the limestone 
by the granite mass, but the limited time at the disposal of the com- 
mittee did not permit them to examine a sufficient area to enable 
them to satisfy themselves on this point. Some of the amphibolitic 
masses included in the granite, however, had the appearance of 
tufaceous material—a fact which is of importance in connection with 
the question of the origin of the amphibolite as a whole. The com- 
mittee considers that this granite intrusion presents one of the finest 
known examples of both exomorphic and endomorphic contact 
action. 
