Geomorphological and sedimentological studies have been carried out in the Jabal Harûn area as a part of the archaeological survey. Remnant wadi terraces along two interconnected wadis in the Jabal Harun area have been mapped and dated using relative techniques. Sections of wadi banks have also been cleaned to study the sedimentary sequences. Sediment samples have been dated using the optically stimulated luminescence (OSL) method in the Dating Laboratory of the Finnish Museum of Natural History.

The research has revealed that the most significant periods of erosion and accumulation of sediment (alluviation) had occurred in the Jabal Harûn area during the Pleistocene. The oldest remnant wadi terraces appear to be more than 45 000 years old as the Middle Palaeolithic material has been found on top of these terraces. This period was followed by heavy erosion. Later on, probably soon after the Last Glaciation, recurrent erosion and deposition cycles of relatively short duration had taken place. This deposition of sediment was followed by another period of erosion, probably during the Pleistocene-Holocene transition. After the early Holocene period, which corresponds to the Neolithic period, erosion and transportation of sediments away from the Jabal Harun area seem to have been the dominant processes. However, there have also been later phases of smaller scale alluviation. Two alluviation phases have been dated in the Jabal Harun area to around 4000-3000 BP and around 2000 BP, respectively. Especially the latest dated period of deposition is interesting, as it is contemporary with the beginning of the large-scale Nabataean agricultural activity in the area. It is possible that this period of sedimentation is related to the construction of the extensive runoff-farming system including barrages in the wadis and terrace walls on the hillslopes. However, it seems that the deposits in the Jabal Harûn area mainly date to the Pleistocene period and are much earlier than the intensive human activity in the area