GRAVE CREEK MOUND, a prehistoric earthwork, near Moundsville, Marshall county, West Virginia, known since as appears from the date cut in a tree growing from its summit. It is the largest of the conical type of mounds in the United States, having a basal diameter of 32o feet, a height of 7o feet, and about 1,870,00o cu. ft. of solid contents. It is symmetrical in form and has a depression in the top. In 1838 excavation dis closed a burial vault at the base and another 3o ft. above, each built of logs and covered with stones. The lower contained two human skeletons, the upper vault one; and with each were thou sands of shell beads, mica ornaments, copper bracelets, and several stone articles, including, it was said, one with an inscrip tion which gave rise to much discussion. Subsequent investigation, however, failed to establish the authenticity of the stone or to prove that it came from the mound.