204 REPORT ON CORRELATION 
examine a large deposit of biotite, formerly worked at this point, and 
which occurs in a granular, green pyroxenite which represents an 
altered limestone, near Wilberforce station. The limestone band 
is here highly altered, owing to the fact that it lies between two great 
bathyliths of granite. 
At Gooderham the committee studied the relation of the limestone 
series to one of the great bathylith intrusions which form the north- 
ern portion of the area mapped by F. D. Adams and A. E. Barlow. 
This, which is known as the Glamorgan bathylith, is here ten miles 
wide and is completely surrounded by the limestone series through 
which it breaks. They first examined the eastern margin of the 
bathylith. Starting from the normal development of the limestone 
series on the line between the townships of Glamorgan and Mon- 
mouth, they went westward toward the bathylith, following the Ursa 
road. They found the limestone series became penetrated by dykes 
of granite in ever-increasing numbers, becoming eventually torn into 
fragments which lay thickly scattered in the granite forming the 
margin of the bathylith. It was noted that the limestone on going 
toward the granite became progressively more impure, being appar- 
ently replaced by amphibolite, and that but few fragments of lime- 
stone could be found among the inclusions of the granite itself. 
The committee then examined the southern contact of the bathy- 
lith in the railway cutting at Maxwell’s Crossing on the Irondale, 
Bancroft & Ottawa Railway. Here they found undoubted evidence 
that the limestone was being changed by the granite, first into a rock 
composed of pyroxene, plagioclase feldspar, scapolite, and calcite, 
and then, when the action was more intense, by a further change 
into a gray amphibolite consisting of hornblende, pyroxene, and 
feldspar, the latter dominantly plagioclase. The committee are of 
the opinion that the evidence is indisputable that the granite bathy- 
liths in this region change the invaded limestone into a dark-gray 
amphibolite, which, together with the fragments of the interbanded 
amphibolites found everywhere in the limestone series, occurs scattered 
throughout the granite mass in the form of included fragments. By 
this statement it is not meant to imply that all of the amphibolites 
of the district are derived from the metamorphism of limestones, 
for in some places the amphibolites appear to be metamorphosed 
