Annual report . s, which are presumablyof sedimentary origin, viz.: (1) Magnesian and non-magnesian crystalline limestones,(2) Iron formation (banded chert, jasper or granular quartz), (3) Rusty schist,(4) Grey gneiss, quartz-mica schist, greywackfi, and quartzite. On the Actinolite-Cloyne map, groups (1), (2) and (4) arc shown by distinctive colors, while on thelarg? scale map showing the iron pyrites deposits near Queensboro, the rusty schist,group (3), is also separated from the other rocks by a color.* These rocks, whichsometimes retain bedding planes, constitute a thick sedimentary series
Annual report . s, which are presumablyof sedimentary origin, viz.: (1) Magnesian and non-magnesian crystalline limestones,(2) Iron formation (banded chert, jasper or granular quartz), (3) Rusty schist,(4) Grey gneiss, quartz-mica schist, greywackfi, and quartzite. On the Actinolite-Cloyne map, groups (1), (2) and (4) arc shown by distinctive colors, while on thelarg? scale map showing the iron pyrites deposits near Queensboro, the rusty schist,group (3), is also separated from the other rocks by a color.* These rocks, whichsometimes retain bedding planes, constitute a thick sedimentary series which pi 5the Keewatin green schists. (1) Crystalline limestones.—Five important areas or belts of limestone arc shownon th map. The first lies in the southwestern corner of the sheet; in it arc found theHenderson and Connolly talc mines. The second belt lies in the vicinity of Actino-lite znd has a width at its widest part, measured across the strike, of a mile and a * No. 22e. 42 Bureau of Mines No. 4. S j£ 1913 The Pre=Cambrian Geology of Southeastern Ontario 43 quarter. The third is shown near the northeast part of the map, to the south of thevillage of Cloyne. The fourth occurs south of Harlowe post office, and the fifth south-west of Queensboro. The limestones, many of which are magnesian, vary from coarseto fine in grain and weather to various tints of brown, grey and blue. Those havingbrown colors are highly magnesian, and those having blue or grey colors are generallylow in magnesia. At times as much as 50 per cent, of silica is present, occurring inbands and irregular vein-like areas, sometimes showing eozoon structure similarto that already described at Belmont lake, Fig. 4, and Madoc. The rocks on thesouth part of lot 1, in the third concession of Elzevir, resemble the magnesian lime-stone at Belmont lake. On the east part of the same lot there are present bands ofactinolite or tremolite in the limestone. Sometimes the limestones have a bandedstructure, as
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectminesandmineralresou
