| This comprises large olistoliths of greywacke sandstone, with interbedded mudstone and siltstone. |
| Ghanem et al. referred to the Hammamat Group as molasse-type sediments that consist of polymictic conglomerate, arkose, greywacke, siltstone and minor mudstone. |
| Some varieties include feldspathic greywacke, which is rich in feldspar, and lithic greywacke, which is rich in tiny rock fragments. |
| This Ordovician rock is composed of laminated mudstone and siltstone with greywacke sandstone. |
| The group includes melange which consists of greywacke, limestone, pillow lava, gabbro and serpentenite blocks in a black shale matrix. |
| The majority of the rocks are weakly metamorphosed coarse greywacke. |
