Annotated record of the detailed examination of Mn deposits observed near the Median Rift Valley of the Atlantic Ocean

This report contains a synopsis of data obtained to date, on sediment cores collected from the Mid-Atlantic Ridge at 45 degrees north latitude, during the cruise of the C.S.S. HUDSON in the summer of 1966. The cores were obtained with the Kullenberg piston corer as modified by Maurice Ewing and described by Ericson and Wollin (1956).