Along Grand Lake the rock is a compact amphibolite [3] with a strike S. 78 degrees E. cut by numerous pegmatite dikes, having a strike N. 30 degrees W. and a dip 79 degrees W.. These dikes vary in width from three to twenty feet. Half way to the head of the lake is a dike [1] having a total width of eight feet, consisting of a central band of segregated quartz, six feet wide, cut by numerous thin sheets of biotite, which probably mark the planes of shearing. The quartz is bordered on either side by a band of orthoclase,' one foot in width. Between these bands of orthoclase and the neighboring amphibolite are narrow bands of schist [2]
One hundred feet south of the above point is a second dike having a similar strike and dip and a width of eighteen feet. A third narrow dike, containing sma
