The Structure of the Jebel Hagab Area, Trucial Oman

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Abstract
Summary: The authors describe and discuss the structure of an area on the western front of the Oman Mountains and east of Ras al Kheima, Trucial Oman, an area of foothills dominated by Jebel Hagab, 1450 m. high. The outcropping strata consist of an upper and a lower series: the former, exposed over most of the area, ranges from Permian to Lower Cretaceous, is almost entirely limestone, and has a total thickness of 3408 m.; the latter is a series of several hundred metres of Jurassic and Lower Cretaceous tuffs and radiolarian cherts, about 50 m. of Aptian limestones, and about 15 m. of conglomeratic Maestrichtian marls: the junction between the two series is well exposed and is a thrust-plane. The overriding sheet, thrust from the northeast in Neogene times, has a series of N.-S. frontal folds with steep or slightly overturned west limbs. Below the thrust of the Jebel Hagab area, exposed in the window of Wadi Hagil, contorted radiolarites are overlain unconformably, partly by Aptian and partly by Maestrichtian, both with basal breccia-conglomerates which include fragments of weathered serpentine. Their closely packed folding is considered to be partly due to submarine gravity slip following uplift. There was also pre-Aptian metamorphism and emplacement of serpentinites. Both the limestone and radiolarite successions of Jurassic and Lower Cretaceous age are facies expressions of the sedimentation in the Persian Gulf embayment of southern Tethys extending southwards between, and overlapping on to, the Arabo-Ethiopian and Indian massifs. The limestones are considered to be a

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