Walls of vein due to post-mineral movement, Plumbago Mine, no. 4 level. The quartz is cut by the hanging wall but on the footwall side grades into stringers which are cut off by the footwall fault. Sierra County, California. 1924. Plate 15-B, in U.S.Geological Survey Professional paper 172. 1932.
Summary
Walls of vein due to post-mineral movement, Plumbago Mine, no. 4 level. The quartz is cut by the hanging wall but on the footwall side grades into stringers which are cut off by the footwall fault. Sierra County, California. 1924. Plate 15-B, in U.S.Geological Survey Professional paper 172. 1932.
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