390 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY. 
tion of a plunging anticline of this character would cause a slight 
northward migration of the surface outcrop of the axis where the 
plunge occurs. This is hardly appreciable, however, in a fold so 
little unsymmetrical. The same may be said of the axis at East 
W averly. 
The next fault-block presents some structural problems that can¬ 
not be solved with the present data. No veins are now worked 
south of the axis; and the position of those mapped in Hind’s 
report (’69) is, ifi view of the errors of location of other structural 
features, problematical. On the north of the axis the veins have 
been thrown north 190 feet. This leaves two possibilities. The 
motion may have been a vertical one, the axis upon denudation 
remaining in the same position, and the veins on the south being 
thrown as far southward as the others migrated northward ; or the 
whole block in its movement may have been wedged northward 
190 feet. At Moose River the horizontal component is marked, 
and very probably conditions are the same here. This conclusion 
is provisional, but is based upon what appears to be a common 
method of faulting in the series. If it be correct, then there has 
been horizontal motion along an almost vertical plane, due to pres¬ 
sure from the south ; and in a section along the axis it would appear 
as though no additional dislocation had taken place. 
The admission of the two small fault-blocks west of the lakes 
rests upon two pieces of evidence. One of these is the map accom¬ 
panying Hind’s report mentioned above, which gives two faults. 
The other is the statement of the owner of the land on which the 
full-line portion of the fault lies, and who has uncovered the land in 
years past for certain leads. At present there are no outcrops, 
hence the direction of the veins in these two blocks cannot be deter¬ 
mined directly. I have copied Hind’s map in this respect, because 
there is no other authority. The offset of the easternmost block is 
based upon the same data as the existence of the third fault. 
Ores. — In the sediments gold is largely in sulphides, even near 
the surface. Slate holds it in paying quantities often at consider¬ 
able distances from veins, but some localities appear to have little. 
This may be due in part, however, to the lack of accurate tests in 
those places. At Moose River pure slate yields in crushing over 
$*2.00 of free-milling gold per ton, and is as rich away from veins 
as near them. Whin is popularly supposed to be barren, but recent 
assays have shown gold up to one or two dollars per ton. Sufficient 
