. Bulletin of the Natural Histort Museum. Geology series. HOWARTH AND MORRIS MINTAQ WADI HAJAR WADI ARUS JEBEL BILLUM WADI KILYA. o° o" o° o°o Q QISHN Berriasian 1 1 1 Mi Minlaq HAJAR , 1,', Tilhonian u 1 1 1 A Arus L —_—_—-_—_ Ki Kilya NAIFA Kimmeridgian 1 1 1 B Billum 1 1 1 1 1 Oxfordian Ma MADBI Callovian 1 1 1 S SHUQRA 1 1 1 1 1 M. Jurassic ?L. Jurassi Ko KOHLAN Pre-Cambrian J ^ ^ -f ^ PC Igneous and metamoqjtiic roclts X X X X Unconformity between Naifa and Hajar Formations Fig. 2 Correlation of (he Jurassic and basal Cretaceous formations in WatJi Hajar. from
. Bulletin of the Natural Histort Museum. Geology series. HOWARTH AND MORRIS MINTAQ WADI HAJAR WADI ARUS JEBEL BILLUM WADI KILYA. o° o" o° o°o Q QISHN Berriasian 1 1 1 Mi Minlaq HAJAR , 1,', Tilhonian u 1 1 1 A Arus L —_—_—-_—_ Ki Kilya NAIFA Kimmeridgian 1 1 1 B Billum 1 1 1 1 1 Oxfordian Ma MADBI Callovian 1 1 1 S SHUQRA 1 1 1 1 1 M. Jurassic ?L. Jurassi Ko KOHLAN Pre-Cambrian J ^ ^ -f ^ PC Igneous and metamoqjtiic roclts X X X X Unconformity between Naifa and Hajar Formations Fig. 2 Correlation of (he Jurassic and basal Cretaceous formations in WatJi Hajar. fromWadi Kilya, near Naifa Cliff, that the youngest beds extend into the basal zone of the Lower Tithonian. Beydoun traced the Naifa Formation about 15 km north-west- wards to the large Jurassic outcrop at Jebel Billum. Here it forms a very striking cliff along the south side of Jebel Billum. Ammonites found by us near the base of the formation near its eastern end, confirm that it is the same age as at Naifa Cliff (though it is truncated at the top by an unconformity, above which are Upper Tithonian marls and limestones of the Hajar Formation). In Wadi Arus, 10 km north-west of Jebel Billum, there is a very prominent series of thick limestones and interbedded marls, espec- ially well-exposed in the road gorge leading down into the upper end of Wadi Arus from the south-east, which Beydoun correlated with the Naifa Formation because of their great lithological similarity. He found a few poorly preserved ammonites in them, which were tentatively determined by Arkell as probably of Tithonian age. More important, however, was Beydoun's collection of some well-pre- served ammonites from the marls and nodules (the 'Breadloaf Concretions') below the thick limestones, and from a few metres of limestone at the base, which are the lowest beds exposed in Wadi Arus. These ammonites were also determined by Arkell as Lower Kimmeridgian, and belong largely to the same species as found
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