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EFFECT OF REPEATED FOREST FIRES   171

The preponderance of birch or poplar of the smaller diameter classes on the areas burned once or twice, as indicated in the accompanying tables (see pp. 176-177, 180-181), is due to ground fires.

PHYSIOGRAPHIC CONDITIONS

 

The geology, topography, and soil conditions of the region in which the area under discussion lies were fully discussed in the report on the Trent Watershed Survey.* Only enough of the description will be repeated here to give the reader a general picture of the area now under consideration.

The portion of Burleigh township examined includes the territory lying east of Eels brook, and is drained into Stony lake by that brook and by Jack creek. The central and eastern portions of Methuen town-ship drain through Kasshabog lake into North river, thence by the Crow river into Trent river. The waters in the north-western portion flow through Jack creek into Stony lake. The extreme south-eastern portion drains into Otter creek, a tributary of Deer river, whose waters also fall into the Trent through Crow river.

General   -The general elevation of the country is approximately

Description   850 feet above sea level, and it has the appearance of

of Territory a dissected plateau, sloping gently in a south-southwestern direction. Between Eels brook, Jack creek and its tributary, Grassy brook, the underlying rock is mostly crystalline limestone, through which are frequent intrusions of granite, especially in the southern division of Burleigh. The topography, on the western side near Eels brook, is quite flat, but becomes more diversified and rougher eastward to the Blue mountains, in Methuen township. These mountains are the most conspicuous objects in the topography of the area, and they are situated almost in the centre of the region under discussion. They rise abruptly on all sides to about 300 feet above the general level and extend about four miles in a northeast and south-west direction. The crest of these mountains is a bare ridge of syenite rock, and the " foothills " consist of numerous ridges of sharply inclined amphibolite or granitic ridges, with deep gullies between. The amphibolite, in a strip about a mile wide, is continued north-eastward to the extreme northeast corner of the township.

Eastward and southward from the Blue mountains, the country has the appearance of a granite plain, into which innumerable gullies and

*Trent 1T'atershed Survey. Commission of Conservation, Ottawa, 1913. Pp. 35-39; 75-76; 108-113.

'This description is summarized from Geological Survey Report, Memoir No. 6, Geology of the Haliburton and Bancroft Areas, Province of Ontario, by +Frank D. Adams and Alfred E. Barlow, 1910.


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