Guide books of excursions in Canada1-10 . ry, the roaddescends a steep hill which forms a cliff-likemargin to the old channel of Rideau river,which was incised along the contact of theOrdovician with the Pre-Cambrian floor. Ahalf mile (-8km.) farther on is KingstonMills. Here the limestone is seen in the railwaycutting to lie unconform- 5 m. Kingston Mills, ably on the Pre-Cambrian. 8 km. A basal conglomerate com- posed of large water-worn boulders of graniteand gneiss cemented in a limestone mud isseen. The limestone is filled with fragmentsof the quartz of the old floor, this beingthe one im
Guide books of excursions in Canada1-10 . ry, the roaddescends a steep hill which forms a cliff-likemargin to the old channel of Rideau river,which was incised along the contact of theOrdovician with the Pre-Cambrian floor. Ahalf mile (-8km.) farther on is KingstonMills. Here the limestone is seen in the railwaycutting to lie unconform- 5 m. Kingston Mills, ably on the Pre-Cambrian. 8 km. A basal conglomerate com- posed of large water-worn boulders of graniteand gneiss cemented in a limestone mud isseen. The limestone is filled with fragmentsof the quartz of the old floor, this beingthe one imperishable mineral it 3 feet (-9 m.) of the actual contact,the limestone becomes much cleaner, and isfilled with fragments of Orthoceras and En-doceras well preserved. The granite in the railway cutting showsperfectly fresh exposures, and some of thefinest possible examples of jointing in threedirections are to be seen. At the east end ofthe rock cut are the Kingston Mills locks onthe Rideau canal, where boats are lowered. 136 Miles and $2 ie^ (l56 nl0 t0 the level °f Lake Kilometres. Ontario. A deep gorge is cut here in thePre-Cambrian gneisses making one of themost beautiful spots on the inland water-waysof Canada. Resuming the journey in a north-easterly direction on the east side 9 m. Blakes Quarry, of the canal, for a dis- 14-4 km. tance of 4 miles, (6-4 km.) Blakes quarry is reached. This quarry isin Potsdam (Upper Cambrian) sandstone,and is noted for the peculiar concretions itcontains. There are innumerable sphericalto elliptical sandstone concretions, but themost peculiar ones are long cylindrical formswhich are popularly called Fossil tree-trunks. These stand in vertical position,and the writer would suggest that they re-present structural forms laid in eddies, con-temporaneously with the surrounding this sandstone was laid down inmoving water is indicated by the abundanceof cross-bedding shown here. The redPotsdam sandstone yields an excel
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectgeology, bookyear1913
