. Special reports on the mineral resources of Great Britain . ills between Bridgeof AUan and Dollar. The positions of these veins are shownon the pubhshed one-inch Geological map, 39, but it is onlynear Blairlogie and Menstrie that any of them are large enoughand sufficiently free from such impurities as quartz and copper-ores, to be of value as sources of barytes. The country-rock consists of a series of interbedded lava-flows, ashes, and volcanic detritus of Old Red Sandstone southern flank of the Ochil Hills is bounded by a large faultwhich trends about 50° E. of N., and throws down
. Special reports on the mineral resources of Great Britain . ills between Bridgeof AUan and Dollar. The positions of these veins are shownon the pubhshed one-inch Geological map, 39, but it is onlynear Blairlogie and Menstrie that any of them are large enoughand sufficiently free from such impurities as quartz and copper-ores, to be of value as sources of barytes. The country-rock consists of a series of interbedded lava-flows, ashes, and volcanic detritus of Old Red Sandstone southern flank of the Ochil Hills is bounded by a large faultwhich trends about 50° E. of N., and throws down Carboniferousrocks on the south. Two sets of veins have been noted in thedistrict, one trending a few degrees west of north and the othernorth-west, but it has not been possible to find out which is theolder set, nor is the relation of the fault to the veins known. PERTH AND CLACKMANNANBlairlooie Veins, 107 Prop. : Colonel Hare, Maps. — One-inch Ordnance and Geological, 39; six-inchPerth and Clackmannan, 133 , P. Fig. 1. Map of the Blairlogte Carboniferous Rocksbe/ow raised beach Scale 1/2 Mile-J The positions of the veins are shown on the map (Fig. 1).The five principal veins, A, E, F, G and H, trend ; whilethe three subsidiary ones, branching off from A, trend in direction. The easternmost vein, or A, occurs nearthe mouth of an old adit on the hill-side about 600 yds. 108 BARYTBS AND WITHERITB of Blairlogie. It hades to the west, and consists of about twofeet of intermingled pink barytes and quartz containing numerousgreen stains due to copper-ores. The three subsidiary veins, B, Cand D, carry the same minerals, but are thin and not next of the principal veins, E, passes 200 yds. east ofBlairlogie. It is not seen at the surface but its presence isinferred from the occurrence of a narrow gully strewn with blocksof pink barytes. The vein appears to be wide, but it has notbeen opened up. The third vein, F, is seen in the crags
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
