67 
The following is the result of an 
the Departmental Laboratory: — 
Si 0 2 
ADO, 
Fa'D, 
FeO 
MgO 
CaO 
NagO 
k 2 o 
H 2 0 -f 
H, 0 - 
co, 
Ti 0 2 
P 2 0 5 
S 0 3 
Cl 
Cr 2 0 8 
mo 
CoO 
MnO 
analysis made by Mr. A. G. Hall, at 
3.90 
85.11 
0.42 
0.41 
0.15 
0.46 
0.26 
0.23 
7.03 
0.07 
nil • 
1.05 
nil 
nil 
nil 
1.40 
nil 
nil 
nil 
Sp. gr. 
100.07 
3.580 
Asbestos. 
No good sample of asbestos was observed, but a stage in that direction 
was noticed, for a blade like arrangement was apparent in the serpentine 
at several points. 
The serpentine is surrounded by stratified rocks that require some work 
to be done on them before their relations can be satisfactorily determined. 
At the junction of Thiele’s Creek with Dolodrook Creek, there is an 
excellent section that Mr. E. O. Thiele has already drawn attention to. The 
serpentine is exposed for a few feet, then crushed serpentine for 5 feet 
and then follow slates dipping south-west at 85 deg., then beds of serpen¬ 
tine detritus, with pebbles of slate at intervals, and so on alternations of 
slate and conglomerate of serpentinous material for 48 feet away from the 
contact with the serpentine rock, then slate beds alternate with bedded 
finer serpentine material for a considerable distance, the beds becoming 
less serpentinous in character as the distance from the serpentine rock 
increases and the material becomes finer in grain. Twenty chains west 
of the junction of Thiele’s Creek and Dolodrook Creek is a bluff of black 
slate on the bank of the latter creek. Graptolites are numerous in this 
black slate and Dr. T. S. Hall has determined them to be of Upper 
Ordovician age. 
The section at the junction of Thiele’s Creek and Dolodrook Creek 
shows that beds of slate alternate with beds of serpentinous; material, 
ranging from fine mudstone to coarse material, and that in this serpen¬ 
tinous bed pebbles of slate also* occur to form a conglomerate. It therefore 
appears probable that an intrusive rock cut through the Ordovician beds 
and subsequently became altered to serpentine, and when the serpentine 
and Ordovician rocks were denuded, the slaty beds were formed of material 
