Deck41 is a digital summary of surficial sediment composition for 36,401 seafloor samples worldwide. Data include collecting source, ship, cruise, sample id, latitude/longitude, date of collection, water depth, sampling device, dominant lithology, secondary lithology, and a brief description of the surficial sediment at the location. Descriptions were abstracted largely from unpublished laboratory reports and core log sheets contributed to the National Oceanographic Data Center prior to 1975. Descriptions were assigned by Ms. Susie Bershad,and Dr. Martin Weiss of the Marine Geology and Geophysics Branch of NODC, which was transferred to the National Geophysical Data Center (NGDC) in 1976, at which time compilation ceased. Data are free for online search and download.