This publication details the stratigraphy of the Murray Basin Province of South Australia. The work leading up to this report has played a major part in the understanding of the sedimentary succession of this important basin-area of the State. The data contained herein are of technical value in the evaluation of the Basin as a source of groundwater, and it also provides an invaluable reference for oil exploration. The Murray Basin is an area of Mesozoic and Tertiary sedimentation divided into two main units, the Murray Basin proper separated by structural highs - the Padthaway "Horst"-from the Gambier Sunklands. Knowledge of the Mesozoie in the Murray Basin proper is limited to two bores in the Loxton area which entered siltstones and mudstones below 1,350ft. fn the Gambier Sunklands an undetermined thiekness of siltstones, mudstones and arkosic sandstones mainly of Lower Cretaceous age occurs. Older rocks are everywhere overlain by a T'ertiary sequence rarely exceeding 1,000ft. in thickness in the basin proper but at least 4,000ft. thick in the Gambier Sunklands. Seventeen rock units are recognized in this sequence, the biostratigraphy of which is described in general terms.