The primary objective of this paper is to re-assess the Jurassic–Cretaceous depositional and tectonic evolution of the southern margin of Neotethys. This re-evaluation islargely based on mapping at the 1:25,000 and 1:50,000 scales of the UAE undertaken by the British Geological Survey between 2002 and 2006 During this work the definitions of the main stratigraphical units and tectonic evolutionary history established record the transition from the platform, slope to basin sedimentation has been fundamental to the interpretation of the geological history of the region regional mapping program suggested that refinement of this model was appropriate and to obtain further evidence, fieldwork was undertaken in northern Oman where visits to the type sections of sediments coeval to those in the UAE were examined.