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Cenozoic volcanic rocks cover vast areas in the Arabian Shield consisting mainly of lava flows associated with pyroclastic de- posits namely scoria and cinders. Markets for pyroclastics include ag- gregate for road construction and surfacing, lightweight concrete and light weight-heat-insulating building blocks. These pyroclastic de- posits are also the main source for the natural pozzolanic material in the Kingdom. The purpose of this investigation is to survey the central part of Harrat Rahat and locate the most suitable sources of these de- posits. A reconnaissance survey was performed on over thirty volcan- ic cones in the specified area and four cinder cones that seem to have suitable scoria deposits both from the economic and engineering points of views, were selected. The preliminary investigations on these sites suggest that Jabal Ha- lat ash Shaykh show the best scoria occurrence in the investigated area. Jabal Al Hala and Jabal as Sahiliyah have suitable quantities of scoria while Jabal Suwah has limited scoria resources. The geology and geomorphology of the four sites are presented in this work. Some geological and geomorphological observations during this survey may help in identifying other craters that may make good sources of scoria deposits in other areas. Results of preliminary laboratory in- vestigations indicate that the material could be economically utilized as lightweight aggregate, cement additive and as heat insulating ma- terial. The measured parameters are compared with the specifications required by the ASTM and other designations. The results of the strength activity index and alkali silica reaction tests were not encour- aging, due to a technical problem, and the tests will be repeated on

Preliminary Geologic and Engineering Assessment of the Pyroclastic Deposits in the Central Part of Harrat Rahat