Simplified geological map of the Furg region based on the published NIOC (National Iranian Oil Company) geological map (1:250,000 scale, Furk sheet (H 40)), and from our own observations from satellite imagery and in the field. The 1990 Furg earthquake fault is situated between two geological faults that thrust Cretaceous limestones of the Bangestan formation over mid to late Tertiary evaporites of the Fars formation. Both geological faults and the sedimentary layers dip at ∼30°N.