South Base, San Miguel Island

South Base, San Miguel Island, base line established in 1858 by William E. Greenwell which “preserves merely a mean elevation above the ocean.” It was marked with red sandstone monuments with the letters U.S.C.G. at both North Base and South Base points. In 1871 the site was revisited by Stehman Forney who found the original undisturbed monuments. “No signals were erected over the stations North and South Base, as they were not required for the topographical work. [The station] is more fully described in volume of Horizontal Measurements on San Miguel Island.” North and South Base stations do not appear on contemporary topographic maps.