WOODMAN : GOLD-BEARING SLATES OF NOVA SCOTIA. 401 
Mica and feldspar occur with the quartz as gangue minerals. How 
(’68) had already reported albite from Waverly. 
Murray (’81) compared the series with the gold-bearing strata of 
Newfoundland underlying the Aspidilla or St. Johns slates, depos¬ 
ited, apparently, at the close of Algonkian times. 
Gilpin (’82) distinguished only one period of folding. The 
strata were opened and the rolls formed at the same time 
and by the same force, the veins entering subsequently at an 
unknown date. The bedded veins were tilled to a great extent 
before lower Carboniferous times, the cross-leads perhaps after that 
period. Later (’86) he assigned the series to the lower Cambrian, 
and called the veins and granite intrusions roughly contempo¬ 
raneous. 
Faribault (’87) regarded the Eophyton of Selwyn as inorganic. 
He divided the rocks of the series into an upper graphitic and a 
subjacent lower Cambrian division. The latter contains 15,000 
feet of strata, 11,000 of which are in Campbell’s lower group and 
4,000 in his upper division. 
Gilpin (’88) placed the summit of the auriferous beds 2,800 feet 
below the base of the upper slate group, and gave them a thickness 
of 5,000 feet. They contain little carbonate of lime, white the 
veins contain much. The latter are associated with predominant 
slates and fihe-grained whin, and their filling appears to have come 
from the country-rock, especialty the slate. The granite intrusions 
are probably later than the folding, although in places they tongue 
into the sediments along the bedding-planes. 
Walcott (’91) thought that the Cambrian may be represented in 
the gold series, but much of it is older. 
Van Hise (’92) regarded Eopliyton as organic, but considered 
the series as probably Algonkian. 
Becker (’95), after compiling the written evidence on the subject, 
considered the veins to have been formed by the same force that 
produced the cleavage. 
Problems for Solution. 
Perhaps of chief importance in the study of the rocks is to ascertain 
their age with some degree of certainty. This can be done only by 
discovering fossils more unequivocally organic and of more strati¬ 
graphic value than any now known along the borders of the series. 
