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.