300 EXAMINATION OF CRYSTALLINE ROCKS—-HONEYMAN. 
Macroscopically examined this diorite is magnetitic. The 
magnet shows also the presence of magnetite. 
The constituents of this rock are therefore Hornblende, Albite, 
Calcite and Magnetite. 
No. 2 is a section of granitoid diorite. 
The Polariscope indicates Hornblende and Albite. 
A macroscopic examination of the rock and the use of the 
magnet show the existence of magnetite. 
We have here metamorphic diorites corresponding in mineral 
constitution with the igneous diorites of Nictaux and Wentworth. 
Pyrite only is wanting in the former. 
No. 3 is a section of the central and summit rock of Antigonish 
Sugar Loaf. It indicates Hornblende, Orthoclase and Magnetite. 
The rock is therefore Syenitic. It is dichroic. The opaque 
portions are seen to be magnetite with direct light. The 
magnet confirms the observation. 
This rock corresponds with that of the elevated grounds on 
the south side of the harbour, which is in connection with the 
Lower carboniferous and fossiliferous limestone. The connection 
is often so intimate, especially on the summit, as to form a 
breccia. The Sugar Loaf rock is in conjunction with meta- 
morphic slates which we have regarded as Cambrian (?). 
The elevation of the syenite with fossiliferous limestone is 300 
feet above the sea level (Bayfield) ; that of the Sugar Loaf is 760 
(Bayfield.) The difference, 460, may therefore be regarded as 
the approximate height of the Sugar Loaf above the sea level, at 
the beginning of the Lower Carboniferous Period, when the 
conglomerate and limestone of the Doctor’s Quarry at the foot of 
the mountain were in process of formation. 
DEVONIAN (?). 
In the mountains, about one mile north of the Sugar Loaf, we 
find out-cropping other Crystalline rocks. A bluff of the series 
is a prominent feature of the east side of Right’s River. (Vide 
Paper IV., page 71, 1875.) Of these I have 3 sections. In all 
the rock appears unindividualized. 
No. 4. The section of the bluff rock is very striking. The 
rock is full of kernels of calcite (amygdales ?) 
