USS Marl (IX-160), a Trefoil-class concrete barge designated an unclassified miscellaneous vessel, was the only ship of the United States Navy to be named for marl. Her keel was laid down under Maritime Commission contract (T. B7.D1) by Barrett & Hilp, Belair Shipyard, South San Francisco, California, on 16 November 1943. She was launched on 2 February 1944 sponsored by Mrs. J. M. Ryan, converted for Navy use as a cargo barge, acquired by the Navy under loan charter from the Maritime Commission on 29 August 1944; and placed in service at San Francisco the same day.