20 Indian Head July 5 - 1918 From Recent notes relating to Indian Head, I take the following: - At the top of the mountains" just out of the prospecting hole there is a large peridotite dike of red granite with great crystals of red feldspar, and sheets of mica, both brown and white 3 or 4 inches across. On either side of this dike for a distance of say 3 feet the dike for a distance of say 3 feet the dark fine grained rock is altered to a mica-schist and is soft and weathering faster than that adjacent. From the dike onward for about 60' the wall is heavy feldded and hard and then getting away farther from the contact the feldding planes are well developed and the sediment is seen to be a fairly even grained dark grey - reddish sandstone. This continues for a considerable distance say 1/4 mile on one cliffy 20" S. 70" E. back toward the dike, the sandstone meets the dike at about the granite dike but is altered and infiltrated with quartz for several feet from the contact. It was clearly injected by the dike since it is dis-torted contemphorally and the dike is not a throaten of some hundreds of feet of this old grey sandstone is shown and it is fairly uniform color and texture. "This sandstone appears to have nothing to do with the Dinbon beds, the latter being variegated in color, with small red and moist beds of shale. The sandstone here exposed looks very old and may be from Precambrian. "Below the sandstone the dike continues most of the