OF PRE-CAMBRIAN ROCKS 205 
pyroclastic material, and in other places they originate from the 
metamorphism of intrusive basic igneous rocks. One of the chief 
difficulties solved in the study of the district by Adams was the 
recognition of the fact that the amphibolites had such diverse origins. 
In the vicinity of Gooderham the committee also examined a 
large occurrence of titaniferous iron ore representing a differentiation 
product of a large gabbro intrusion which occurs to the south of 
Gooderham. This iron ore is situated on lot 35 of Range IV of the 
township of Glamorgan. They also saw several occurrences of 
graphite in the limestone series in this vicinity and examined three 
occurrences of nepheline syenite which are here found penetrating 
the limestone series. ‘These nepheline syenites hold in many places 
inclusions of calcite, often of microscopic dimensions, which are 
clearly fragments of the limestones in which the nepheline syenites 
occur. 
Leaving Gooderham, the party went north across the entire width 
of the Glamorgan bathylith to Haliburton. They found the bathy- 
lithic mass to form an area of very rough country, unlike that under- 
lain by the limestone series. ‘They also found the bathylith to con- 
sist chiefly of a fine-grained reddish gneissic granite, very poor in iron 
magnesia constituents. This, however, contained almost every- 
where numerous inclusions of several varieties of amphibolite which 
the committee believe can be clearly proved, as held by Adams and 
Barlow, to represent fragments of the invaded limestone series. In 
addition to these there are considerable bodies of a grayish gneiss, 
which are believed to represent amphibolite inclusions which have 
been entirely absorbed or dissolved by the granite magma. It was 
stated by Adams that throughout the whole great area to the north 
of the district examined by the committee the bathylithic masses 
of granite were filled with similar inclusions. He estimates that 
these bathyliths on an average consist of about 80 per cent. of the 
red granite, 10 per cent. of the gray gneiss, and ro per cent. of amphi- 
bolite inclusions, resulting in the way above mentioned. 
About Haliburton the committee found the limestone series appear- 
ing in great force, developed in some places as great cliffs of white 
marble. This limestone can be traced continuously around the 
east end of the bathylith to the Ursa road and to Maxwell’s Crossing, 
