Geology of the Ruwais 1:100 000 map sheet, 100-28, United Arab Emirates

This Sheet Description describes the geology of the Ruwais 1:100 000 scale geological map. The Ruwais district includes a strip of the UAE mainland along the Gulf coast, extending from Ras al Quilja in the east to beyond Jebal Dhanna in the west, and the island of Sir Bani Yas. This district is particularly important for its exposures of two Hormuz Complex salt domes (Jebal Dhanna and Sir Bani Yas) and for its extensive outcrops of Miocene bedrock, including the type section for the Hamra Member of the Baynunah Formation. The oldest rocks in the area are those of the Neoproterozoic Hormuz Complex, exposed on Jebal Dhanna and Sir Bani Yas. The islands are cored by salt domes with excellent outcrops of the Hormuz breccias. These were mapped at 1:25 000 scale and larger clasts (those 10 m or more across) have been shown on the map (as igneous and sedimentary megaclasts). Both islands contain a range of clasts from