Report on the geology of the state of Maine . a a a Strata of blue limestone, with veins of calcareous spar near the Trap dykes,c Vein of Drift. Three hundred yards south-west from the mine we havejust described, occurs another vein of the same kind of ore,which differs from that only in the color of the blende orsulphuret of zinc, which in this vein is of a dark brownishblack color. The vein is one foot wide, and is contained inlimestone, at its junction with the trap rocks. Its directionwe found to be E. and W. and its dip 64° South, A galleryha* been cut through this vein
Report on the geology of the state of Maine . a a a Strata of blue limestone, with veins of calcareous spar near the Trap dykes,c Vein of Drift. Three hundred yards south-west from the mine we havejust described, occurs another vein of the same kind of ore,which differs from that only in the color of the blende orsulphuret of zinc, which in this vein is of a dark brownishblack color. The vein is one foot wide, and is contained inlimestone, at its junction with the trap rocks. Its directionwe found to be E. and W. and its dip 64° South, A galleryha* been cut through this vein, and carried on towards those TOPOGRAPHICAL GEOLOGY. 23 we have described above; but owing to the death of thechief miner, Featherstonhaugh, who was drowned in thewreck of the Eastport packet Sarah, the work was discon-tinued, and has never been resumed. The following diagramshews the position of this a Strata of Argillo-ferruginous Dyke of greenstone trap-rock,c Veins of calcareous Vein of galena and Entrance to the drift. At Leightons Point, on Denbos Neck, the argillaceouslimestone was observed running N. W. and S. E. and dipping36° N. E. It has been broken up by the intrusion of trapdykes, and near their point of contact we found a vein ofthe sulphurets of lead and zinc. The vein is 14 inches wide,and the lead ore is nine inches in thickness ; the remain-der of the vein consists of black blende, or sulphuret ofzinc, and calcareous spar. The walls of the vein areincrusted with yellow ochreous oxide of iron, to the thicknessof three or four inches on either side. This vein has beenexposed by the action of the sea, and the shore is strewedwith rounded masses of lead ore, which have thus beendetached. The direction of the vein is N. N. E., and S. S. its upper surface is covered with soil, it was impossiblefor us to trace its extent through the r
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