132 SUPERFICIAL GEOLOGY—HONEYMAN. 
In our illustrative process I would use the initial capitals. A 
for the Cobequid archean, T for the Blomidon, &c., igneous 
rocks, and G for the granites of Halifax, Kings and Annapolis 
Counties. Also, the small letters a, t, g, respectively, for 
boulders derived from these rocks. 
The notable peculiarity of the central division is the prevalence 
of “ Amygdaloid Boulders” with amygdules of zeolite minerals, 
It was the discovery of these in 1874, their identification with 
the triassic rocks of Blomidon and the establishing of a connec- 
tion between these and this their parental source, by means of 
the Halifax glaciation course, that led to the investigations in 
superficial geology, of which we now give the leading results. 
Associated with these amygdaloids and still more prevalent are 
found gneisses and cognate boulders from the archzean rocks of 
the Cobequid Mountain. Weare thus led to indicate this form- 
ation in our map by a colour (red) corresponding with the char- 
acteristic colour of the deposit and the letters, t, a, (triassic, 
archzean). A line having a course 8. 20 E., N. 20 W., magnetic 
or hypothetic extension of one of the prevailing glaciation lines, 
pervades the colour, connecting the deposits of the formation. 
We would now define the Central Division on the map. 
Regarding the Cobequid Mountains on the North and the At- 
lantic Coast on the South as two lines, we draw another (meri- 
dian line) through Blomidon connecting the other two. From 
Three Fathom Harbor, the S. E. extremity of the central forma- 
tion, we draw another meridian extending to the Cobequids. We 
have thus an area of which the glacial course is a sort of diagonal, 
comprehending the Central Division. 
On the East of this, we draw a meridian-line from Clam Bay, 
on the Atlantic, long. 63° to the Cobequids. This area compre- 
hends the Eastern Division. 
On the west of the Central Division we also draw a meridian 
line from the Atlantic, near long. 63° 65° to North Mountain. 
This area comprehends the Western Division. 
The Central Division is farther sub-divided. One grand grani- 
tic area occupies the south west side, and another intrudes into 
the eastern side. While we regard these rocks as Archean, we 
