Guide books of excursions in Canada1-10 . Report of the Special International Committee on the Nomenclature of the Pre-Cam-brian Rocks of the Lake SuperiorRegion: Jour. Geol., Vol. XIII,1905. 6. Report on the Special Committee on the Correlation of the Pre-Cambrian rocks of theAdirondack Mountains, the Ori-ginal Laurentian Area of Canadaand Eastern Ontario: Jour. XV, 1907. 7. Holland, T. H Mem. Geol. Surv. Ind., Vol. XXX, Part 3, 1901. 8. Lawson, A. C Bull. Dept. Geol. of Calif., Vol. Ill, No. 8. 35064—7 989. Morozewicz, J Tscher. Mitt. Band XVIII, 1908. 10. Sauer. A Das alte Grundge
Guide books of excursions in Canada1-10 . Report of the Special International Committee on the Nomenclature of the Pre-Cam-brian Rocks of the Lake SuperiorRegion: Jour. Geol., Vol. XIII,1905. 6. Report on the Special Committee on the Correlation of the Pre-Cambrian rocks of theAdirondack Mountains, the Ori-ginal Laurentian Area of Canadaand Eastern Ontario: Jour. XV, 1907. 7. Holland, T. H Mem. Geol. Surv. Ind., Vol. XXX, Part 3, 1901. 8. Lawson, A. C Bull. Dept. Geol. of Calif., Vol. Ill, No. 8. 35064—7 989. Morozewicz, J Tscher. Mitt. Band XVIII, 1908. 10. Sauer. A Das alte Grundgebirge Deutsch- lands, etc., Comptes Rendu, deIXeme Congres Geol. Internat.(Vienna) 1903, and other papers. 11. Smyth, C. H Report on the Crystalline Rocks of St. Lawrence County, Museum, 49th Ann. Rep.,1895, Vol. II. 12. Stansfield, A Tool steel direct from the ore in an electric furnace: Min. Inst., Vol. XIII, 1910. 13. Washington, H. .Chemical Analyses of Igneous Rocks: U. S. G. S., Prof. Paper,No. 14, Geological Survey, Canada. Figure!. The Asbestos District of Quebec 9 99EXCURSION A 5. Asbestos Deposits of the Provinceof Quebec. BY Robert Harvie. CONTENTS. PAGE Introduction loo General description of asbestos producing ioi Physical features ioi General geology 102 Table of formations 104 Thetford series 104 Peridotite and serpentine 104 Pyroxenite 105 Gabbro 105 Diabase 105 Granite 106 Structural relations 106 Broughton series 108 Economic geology 108 Black Lake 110 Rock types of the peridotite series no Occurrence and relations of asbestos veins in Mining and milling of the asbestos bearing rock. 113 Chromite 114 Thetford 116 East Broughton 116 Rock types 116 Sills 117 Bibliography 117 35064—7I IOO INTRODUCTION. The purpose of this excursion will be to examine thecharacter and mode of occurrence of the asbestos andchromite deposits of Quebec, and to observe the methodsof mining. At Thetford and Black Lake the asbestosoccurs in an
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