. Bulletin de la Société géologique d'Amérique. La géologie, la Géologie -- United States. Les graviers et sables bitumineux de surface. 85 qui occupe le poste d'en face d'une plage. Les arêtes peuvent être remplacées par des cônes, ressemblant à des dépôts delta. Les crêtes sont souvent à peine moins direct et guère plus cassé ou plus la hauteur varie de plages, en particulier lorsque l'érosion et l'inégalité de l'altitude, causée par les mouvements terrestres depuis les graviers ont été déposés, est pris en compte. Les crêtes sont souvent trouvés à diviser et à joindre électrique-comme des dépressions, parfois sèches, parfois contai

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. Bulletin of the Geological Society of America. Geology; Geology -- United States. SURFACE GRAVELS AND SANDS. 85 which is occupying the position as in front of a beach. The ridges may be replaced by cones, resembling delta deposits. The ridges are often scarcely less direct and scarcely more broken or more varying in height than beaches, especially when the subsequent erosion and unequal elevation, caused by terrestrial movements since the gravels were deposited, is taken into account. The ridges are often found to divide and enclose kettle-like depressions, sometimes dry and sometimes containing ponds or lakelets, just like similar depressions along modern beaches, but on a larger scale. Branches and spurs add to the undulating appearance of the country. In front of these hills the plains may be covered with gravel. It is very difficult not to see in these ridges the remains of beaches belonging to former shore-lines. A single ridge of this character occurs behind a plain just north of Stouffville, Ontario, rising to a height of seventy-five feet above the plain, which is about 1, 100 feet above the sea. This deposit rests against another and some- what larger ridge of sand and gravel belonging to group I b. Again, within a distance of about fourteen miles, stretching northwestward from a point near Flesherton (shown in fig. 7), there are three steps, each in the form of a slightly undulating plain, often paved with gravel, bounded by just such hills of gravel as are here described. These marginal ridges are much indented with kettle depressions (k, k, fig. 7), and are somewhat. Figure 7—Section extending Northward from near Flesherton. b = Boulder pavement. g, g = Ridge.s of Artemisia gravel, k, k = Depressi' as behind the gravel ridges. beneath the level of well-marked terraces, as if a somewhat off-shore deposit. The elevation of the country above the sea descends from 1, 600 to 1, 200 feet. The ridges (g, g, fig. 7) border a mass of land that was rising out of,

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