202 REPORT ON CORRELATION 
with a considerable volume of bedded amphibolites and fine-grained 
gneissic rocks which either represent intercalations of muddy sedi- 
ments analogous to those forming the paragneisses about Millbridge, 
or have originated from the complete alteration of volcanic ashes 
which fell into the sea at certain times during the deposition of the 
limestones. The chemical composition of the majority of these 
amphibolites is such that they might be derived either from the altera- 
tion of calcareous silts or from showers of basic volcanic ashes. 
The existence of numerous gabbro intrusions, having a more or less 
rounded outline, in association with this limestone series, more espe- 
cially where these amphibolite bands are abundant in it, suggests 
that these represent the bases of volcanic centers from the ejecta- 
menta of which the amphibolites were derived. 
Having gone north on the Hastings road as far as Murphy’s Cor- 
ners, the committee then proceeded to Gilmour, a station on the 
Central Ontario Railway about five miles to the east of the Hastings 
road, to examine certain conglomerates which are found in that vicin- 
ity associated with two bodies of granite which penetrate the limestone 
series. 
The committee considered these conglomerates to be in part 
of autoclastic origin, and, in all probability, in part of volcanic origin, 
representing tufaceous material derived from volcanic centers now 
represented by the masses of granite associated with it. Dr. Barlow, 
however, who mapped the occurrence, considers them to be of exclus- 
ively autoclastic origin. The time at its disposal did not enable the 
committee to make a detailed examination of the stratigraphical rela- 
tions of this conglomerate, but after the field-work of the committee 
was brought to a close, Messrs. Cushing and Adams returned to this 
locality and re-examined the conglomerates. They found that they 
were interstratified with limestones, and consequently of the same age 
as these rocks, and that, on approaching the granite mass lying to the 
east, these rocks were thrown into a series of very sharp folds, evidently 
due to their being pressed against the granite mass, and that the 
granite mass, immediately about its contact with these rocks, exerted 
a very pronounced exomorphic contact action, changing the lime- 
stones for a distance of at least 100 yards into a mass of reddish-green 
rock consisting of an admixture of epidote, garnet, pyroxene, and 
