TY - RPRT TI - Hydrothermal palygorskite and ferromanganese mineralization at a central California margin fracture zone AU - A. E. Gibbs AU - J.R. Hein AU - S.D. Lewis AU - D. S. McCulloch PY - 1993 DO - 10.1016/0025-3227(93)90074-6 UR - https://pubs.usgs.gov/publication/70018011 ID - 70018011 ER -