The entire sequence has been intruded by sills of the Hart dolerite, several of which are strongly expressed in this scene. Members of the Adelaidean System occur in scattered outliers in both the Sturt Platform and the Kimberley basin. In the lower right corner of the scene, these dip gently to the southeast. Additional deformation took place in the Paleozoic. These rocks include jointed sandstones, siltstones, shales, dolomites, and tillites.
Some units form impressive scarps.
Many of the ridges are really escarpments, or cuesta-like. Drainage channels are discordant in part, where they cut across the structure. Figure T-56.3 shows the terrain along the Ord River from the ground. Landsat 1377-00573, August 4, 1973.