The Spalding Inlier, about 150 km north of Adelaide, is the core of a faulted anticlinorium providing a unique exposure of some of the oldest sediments in the southern half of the Adelaide Geosyncline. The discovery of stromatolites within the inlier (Forbes and J. Johnson, 1966) suggested the value of further search and of mapping the inlier to determine the stratigraphic relationships of the beds. West of the inlier, W. Johnson (1964) mapped an anticline with sandstones on its limbs and having River Wakefield Group rocks in its core, which extend as a thin strip northwards from Forbes1 (1964) type area. The sandstones were correlated with the Rhynie Sandstone (Wilson, 1952), and the immediately adjacent Spalding Inlier was regarded as diapirically emplaced River Wakefield Group. More detailed mapping by Forbes and J. Johnson (1966) revealed that the inlier is mostly fault-bounded and consists of a folded sequence of beds essentially in situ; they correlated this sequence with certain units of the River Wakefield Group. As a result of measuring sections near the River Broughton, Forbes (1969) demonstrated that W. Johnson's (1964) anticline west of the inlier does not exist, and that the two sandstone "limbs" are in fact separate horizons, both west-facing. The upper horizon underlies Skillogalee Dolomite and was correlated with the Rhynie Sandstone, although it lacks heavy mineral lamination. The lower horizon does have heavy mineral lamination and consists of two members separated by a dolomite mapped by W. Johnson (1964) as a crush zone. The lower horizon underlies all the units of the River Wakefield Group previously named by Forbes (1964). This note is a preliminary report on the stratigraphy and relationships of the Spalding Inlier. A traverse in the vicinity of the River Broughton was chosen for initial investigation as this includes the best outcrops in the area. On the east limb of the regional anticlinorium, the sequence below the Undalya Quartzite (fig.1) is highly condensed and is structurally concordant with the beds in the inlier. This latter sequence consists of siltstones, limestones, dolomites, impure sandstones and locally, volcanics, whose base is unknown and whose upper boundary may be subject to several interpretations. It is proposed that this important sequence, which is distinctive and different from the probably younger River Wakefield Group, be named River Broughton Beds, with its type section 0.3 km north of the River Broughton and 3.5 km south-west of Spalding (Fig. 1).