Mcgitnia Scries of Nova Scotia. — U'oodmaii. ig 
Lake, ^looscland, and Taiit^icr are situated on three of the 
arches . A cross section of the region shows that none of these 
anticHnes give horizons at the surface which are exact strati- 
graphic equivalents of each other. From the axis at Moose 
River at the lowesr kno\yn horizon, to the upper contact of the 
Goklenville formation on the north, the dips are all north ; and 
give about 16,900 feet of strata. Allowing 400 feet as the 
maximum thickness of the slate horizon at Moose River, there 
are 16,500 feet of Goldcnville strata stratigraphically over it; 
and in that thickness at least three zones of slate-bearing rocks 
should appear. 
Three go'od traverses are possible from the Moose River 
axis northward in and near the district of that name — a west- 
ern one, two or three miles west of the main settlement, along 
the old ]\roose River road north to Higgins settlement; a sec- 
ond along the present road north from Moose River mines; 
and an eastern one, three miles east of the mines, along the dis- 
used road through the Icelandic settlement. All these tra- 
verses give numerous exposures, and it seems impossible that 
slate-bearing horizons aggregating probably 4500 feet in thick- 
ness, should escape observation ; but they have not been seen. 
Moreover, the vein-bearing horizon at Caribou shows no slate 
or leads where it emerges again from under the Halifax form- 
ation, south of Caribou. These facts would indicate that not 
only do individual strata extend a comparatively short distance 
north and south, but that whole groups of strata, represent- 
ing individual and localized conditions of deposition, are quite 
circumscribed in their extent. Indeed, it is often impossible 
to match strata satisfactorily on the opposite sides of a single 
anticline and within a few hundred feet ; and this, too, with 
good artificial exposures. 
Continuity of strata: a!ong the strike. — The same criteria 
are more difficult of application directly along the strike, be- 
cause the pitch of the domes is always gentle compared with 
the dip of the legs of the anticlines. One case, however, is 
especially noticeable. The dome at Caribou, Halifax county, 
is located at the top of the Goldenville formation ; and its po- 
sition is closely defined by the only exact datum plane we 
know — the contact with the base of the Halifax. Eastward 
ten miles, along tlie same axis, the Goldenville emerges from 
