. The Quarterly journal of the Geological Society of London. H. A. £., Pkotoviicro. Bemrose, Collo. QUARTZITE IN MOUNTAIN-LIMESTONE AND KEUPER SANDSTONE. Vol. 60.] QTJARTZITE-DYKES IN MOTTNTAIN-LIMESTOKE. 369 Plate XXXI. [The figures were photographed by the Author from the microscope, underpolarized light with crossed nicols, and enlarged 50 diameters.] Fig. 1. Thin slice (1316) from the 4-inch dyke shown in Pi. XXX, fig. p. 305. 2. Thin slice (1318), showing the formation of secondary silica in optical continuity with the rounded quartz-grains, from a second dyke. Seep. 365. 3. Thin sl
. The Quarterly journal of the Geological Society of London. H. A. £., Pkotoviicro. Bemrose, Collo. QUARTZITE IN MOUNTAIN-LIMESTONE AND KEUPER SANDSTONE. Vol. 60.] QTJARTZITE-DYKES IN MOTTNTAIN-LIMESTOKE. 369 Plate XXXI. [The figures were photographed by the Author from the microscope, underpolarized light with crossed nicols, and enlarged 50 diameters.] Fig. 1. Thin slice (1316) from the 4-inch dyke shown in Pi. XXX, fig. p. 305. 2. Thin slice (1318), showing the formation of secondary silica in optical continuity with the rounded quartz-grains, from a second dyke. Seep. 365. 3. Thin slice (1235), quartz and felspar cemented by calcite, from a third dyke. See p. 365. 4. Thin slice (1086), quartz and felspar, from a fourth dyke. See p. 365. 5. Thin slice (1238) from Marston-Common well: quartzite. A piece of mica is seen near the centre of the figure. See p. Thin slice (1319) from the quarry south of Marston-Common Farm :sandstone. See p. 368. Discussion. The Chairman (Mr. H. B. Woodward) remarked that the subjectof sandstone-dyke
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
