| Dominant geologies within the RUB include basalt, scoria and tuff, conglomerate, mudstone, sandstone, turbidite, and unknown or manmade landfill. |
| The group is subdivided into formations, which each represent a turbidite lobe, and are separated by anoxic background sedimentation. |
| Greywacke is an old term still sometimes used for a particular type of wacke especially in grey-coloured turbidite sequences. |
| Both turbidite units are sand rich, and typically interpreted as the deposits of high-density turbidity currents. |
| Thick shale packages, approaching 30 m thick, occur interbedded with the turbidite sandstones. |
| The rock sequence formed by a turbidity current is called a turbidite. |
