. Bulletin of the Natural Histort Museum. Geology series. 22 HOWARTH AND MORRIS. — B \$$^ T Wa C o o o Q -1 -1- H 1- 1 -1 Sb Quaternary Basalt, Quaternary Tertiary (Palaeocene, Eocene) Cretaceous, post-Qishn Formation Qishn Formation, U. Hajar Formation, Berriasian Sabatayn Formation Unmetalled roads River in Wadi Hajar "O- Hot spring Fig. 19 Geological Map of the Mintaq Salt Dome: X is the position of the succession in Figs 14 and 20. Evidence for the age of the upper part of the Billum Member comes from the large specimen of Crussoliceras cf. wegelei Enay found in


. Bulletin of the Natural Histort Museum. Geology series. 22 HOWARTH AND MORRIS. — B \$$^ T Wa C o o o Q -1 -1- H 1- 1 -1 Sb Quaternary Basalt, Quaternary Tertiary (Palaeocene, Eocene) Cretaceous, post-Qishn Formation Qishn Formation, U. Hajar Formation, Berriasian Sabatayn Formation Unmetalled roads River in Wadi Hajar "O- Hot spring Fig. 19 Geological Map of the Mintaq Salt Dome: X is the position of the succession in Figs 14 and 20. Evidence for the age of the upper part of the Billum Member comes from the large specimen of Crussoliceras cf. wegelei Enay found in a limestone about 8 m below the top of the member in a roadside cliff east of the Al Ma'abir road/river crossing (Fig. 3), which is of Divisum Zone, Lower Kimmeridgian, date. The top bed of limestone of the Billum Member forms a pavement below the west side cliff in Wadi Arus and many crushed Streblites and indeterminate perisphinctids, some of which are probably Torquatisphinctes, can be seen on the surface (Fig. 16). These are of Eudoxus or Beckeri Zone, Upper Kimmeridgian, age. The abundant brachiopods in the Shuqra and Madbi Formations disappear in the higher formations, except in the lower part of the Billum Member where there are two m thick marly limestones, the "Microthyridina Beds', 4 m and m above the base of the member and well seen at the base of the Perisphinctid Cliff in east Jebel Billum, that contain many large examples of Mkmthyridina farquharsoni Muir-Wood, accompanied by a few Kallirhynchia and Somalirhynchia. No brachiopods were found higher in the Billum Member. Bivalves and gastropods are also much less common above the top of the Madbi Formation, though some occur in 'shell beds' and at a few other horizons, such as the "Microthyridina Beds' in the bottom 4-9 m of the Billum Member. 2. The Kilya Member. This member is dated as Beckeri Zone, Upper Kimmeridgian, and Hybonotum Zone, Lower Tithonian. The Beckeri Zone is represented by a v


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