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| [I. Introduction.] | |
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| [1. Location and area] | 5 |
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| [2. Statement of work] | 5 |
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| [3. History of development] | 6 |
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| [II. Summary and Conclusions] | 8 |
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| [III. General Character of District] | 10 |
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| [1. Means of access] | 10 |
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| [2. Topography] | 11 |
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| [3. Drainage] | 14 |
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| [4. Flora and fauna] | 15 |
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| [IV. General Geology] | 16 |
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| [1. Outline of Geological history] | 16 |
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| [2. Table of formations] | 18 |
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| [3. Keewatin] | 18 |
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| [General features] | 18 |
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| [Obushkong area] | 18 |
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| [Duncan Lake area] | 20 |
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| [Pigeon lake area] | 21 |
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| [Unfinished areas] | 22 |
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| [4. Laurentian] | 23 |
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| [General features] | 23 |
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| [Relations to other formations] | 24 |
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| [5. Huronian] | 25 |
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| [General features] | 25 |
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| [Basal conglomerate] | 26 |
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| [Greywacke slate and quartzite] | 27 |
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| [Upper conglomerate] | 27 |
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| [Arkose] | 28 |
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| [Structural features and disturbances] | 28 |
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| [Relations to other formations] | 29 |
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| [Origin and correlation] | 31 |
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| [6. Post-Huronian eruptives] | 32 |
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| [Quartz diabase] | 32 |
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| [Character of intrusion and distribution relative to older systems] | 32 |
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| [Macroscopic character] | 33 |
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| [Microscopic character] | 34 |
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| [Local description] | 36 |
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| [Age] | 37 |
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| [Olivine diabase] | 38 |
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| [7. Pleistocene] | 38 |
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| [V. Economic Geology] | 40 |
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| [1. Silver] | 40 |
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| [Distribution] | 40 |
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| [Surface indications] | 40 |
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| [Structure of veins] | 41 |
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| [Composition of veins] | 41 |
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| [Local description] | 42 |
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| [Future possibilities] | 44 |
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| [2. Copper] | 45 |
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| [3. Iron ores] | 45 |
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| [Hematite] | 45 |
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| [Magnetite] | 46 |
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| [4. Asbestos] | 46 |
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| [Distribution] | 46 |
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| [Origin] | 47 |
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| ILLUSTRATIONS. |
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| [1. Frontispiece—View at Foot of Duncan Lake] | 5 |
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| [2. Diagram illustrating the structure of large hills] | 12 |
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| [3. Diagram illustrating geological relationships] | 16 |
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| [4. View looking north from middle of Duncan Lake, 550 ft. hill in distance] | 20 |
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| [5. West Branch Montreal River, near Mosher Lake] | 22 |
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| [6. Fifth portage on West Branch of Montreal River, showing Huronian slate] | 30 |
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| [7. Inclined Huronian Beds, Duncan Lake] | 32 |