Bulletin of the United States Geological Survey--The Nature and Origin of Deposits of Phosphate and Lime . gneiss. Thecountry in. the Quebec apatite district is rough and mountainous. Thehills are of a remarkably uniform height, rarely rising over fivehundred to six hundred feet above the level of the neighboring DuLievre River. In Ontario, on the other hand, the land in Leeds,Lanark, Frontenac, and Addington Counties* ia low, and sometimesshows a smooth, glaciated surface, covered by a thin layer of Renfrew County, however, the land is more hilly, and resemblesthat of the Ottawa distr
Bulletin of the United States Geological Survey--The Nature and Origin of Deposits of Phosphate and Lime . gneiss. Thecountry in. the Quebec apatite district is rough and mountainous. Thehills are of a remarkably uniform height, rarely rising over fivehundred to six hundred feet above the level of the neighboring DuLievre River. In Ontario, on the other hand, the land in Leeds,Lanark, Frontenac, and Addington Counties* ia low, and sometimesshows a smooth, glaciated surface, covered by a thin layer of Renfrew County, however, the land is more hilly, and resemblesthat of the Ottawa district. As before remarked, the apatite occurs,almost without exception, in association with pyroxenic or hornblen-dic rocks. This rule holds especially true in the Quebec district, (499) 26 DEPOSITS OF PHOSPHATE OF LIME. [bull. 46. where the phosphate has never yet been found without being asso-ciated with pyroxene rock, possibly often of vein origin. This, calledpyroxeuite by Prof. T. Sterry Hunt, occurs in ridges, running iu a gen-eral northeast and southwest direction, following the general course of. Fig. 4. Dike at Union mine, Portland West, Ottawa County, Quebec, Canada. A, apatite; B, trap; C, pyroxene. the strike of the country gneisses. It forms, together with lilac-coloredorthoclase, quartzite, and trap, the mass of many of the hills in thephosphate district, while the stratified and massive gneisses are oftenseen bordering the sides of the ridges, as shown in Fig. 5.
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