REVIEWS 
Geology of the Haliburton and Bancroft Areas, Providence of Ontario. 
By Frank D. ApAms and ALFRED E. BARLow. Ottawa: 
Canada Department of Mines, Memoir No. 6. Pp. 419; 
70 photographic illustrations, 7 figures, 2 maps. 
The Haliburton and Bancroft areas described by Adams and Barlow 
are located in the southeastern part of Ontario within the Canadian 
Protaxis. They constitute a pre-Cambrian complex of about 4,200 
square miles, of which the southern portion, the Bancroft area, consists 
mainly of limestone and dolomite, with minor clastic sediments, in- 
truded by syenites, gabbros, and diorites, and intercalated with acid 
eruptives, the whole invaded by an enormous batholithic development 
of granite gneisses and granites, exposed mainly in the Haliburton 
area to the north, and making up more than half of the total extent 
of the region. This complex was intricately folded in pre-Cambrian 
times, mainly under conditions of flow contemporaneously with the 
intrusion of the granite gneisses and granites, the major axis of 
deformation being N. 30° E. 
Like most of the Protaxis, this region is beveled by a nearly level 
plane of erosion whose inequalities result from etching and the uneven- 
ness of glacial deposition. Here and there monadnocks of igneous rock 
rise to a height of several hundred feet above their surroundings. To 
the south, this surface dips under nearly horizontal Paleozoic limestones 
beveled by a much smoother plain. The fertility and cultivation of the 
conspicuous, steep-faced outliers of Paleozoic limestones studding the 
boundary, contrast strikingly with the more sparsely settled, slightly 
tilted pre-Cambrian, much of which is a succession of low, rolling, 
barren knobs of rock rising from a bowlder-strewn waste, whose drift 
and rock depressions are frequently occupied by lakes or swamps. 
Green, unbroken forests still withhold a portion of it from the desolateness 
to which it is doomed, a land in which canoe and trail are still necessities 
of travel. From the Paleozoic front, the undulating plain which bevels 
the pre-Cambrian rocks rises toward the northeast, with a gradient of 
about 8 feet per mile, to a wavy line of maximum elevation of about 
1,500 feet trending a little south of east through the northern part of the 
99 
