OF DYNAMICAL GEOLOGY—BAILEY. 193 
vicinity a mass of granite, 20 or 30 feet wide, may be seen 
enclosed between tilted beds of quartzite and running for 100 
yards or more in perfect conformity with the latter, then suddenly 
terminating. On the other hand on the Shelburne River, where 
crossed by the post road, may be seen a good illustration of the 
intricate blending of the granitic and schistose masses commonly 
met with along their lines of contact. Regularly stratified beds 
are, as before, abruptly cut off across their line of strike, long 
‘irregular tongues of granite invade the associated strata, and 
what look like detached blocks of the latter are sometimes com- 
pletely enclosed by granite. 
In the section on the Nictau River, already referred to, and 
just north of Alpina Station, is a good opportunity of studying 
the intrusion of granitic masses among Devonian strata, showing 
both the exotie origin of the granite and the period of its 
extrusion. 
In connection with the granitic masses, both small and large, 
occur numerous veins in which the constituent minerals of 
granite, viz., quartz, felspar and mica, have been segregated out 
on a larger scale, affording fair specimens of each. A good 
illustration of such segregated veins may be seen at the western 
head of Liverpool Harbor, at the Government Breakwater, where, 
in addition to good specimens of felspar, may be found sheafs of 
pale yellowish plumose mica. In some instances these veins 
carry tourmaline and garnet as well as mica. 
Still a third type of veins, abundantly illustrated in the 
region under review, is found in connection with the traps of 
Digby Neck. Like the veins in the Cambrian rocks, first 
described, these are usually silicious, but whereas the former are 
of pure milky quartz, with accompaniments of metallic sulphurets 
and gold, the latter are as generally highly colored and banded, 
including all varieties of agate, jasper, chalcedony, &c., as well 
as amethyst, while the associated minerals are calcite, zeolites of 
many varieties, together with oxides of iron (hematite, martite, 
magnetite). Simple veins of agate and jasper, from one quarter 
of an inch to a foot in diameter, may be seen almost anywhere 
