. Bulletin of the Natural Histort Museum. Geology series. 12 HOWARTH AND MORRIS. — $$$$$$- <^^^^ °o\° Q -i-i-i- -l-l- H - 1 —1 -1 - III N 1 1 ;m-i-i m s •;•;•;•; k Kv Quaternary Tertiary (Palaeocene, Eocene) Cretaceous, post-Qishn Formation Qishn Formation, U. Hajar Formation, U. Tithonian Naifa Formation, U. Madbi Formation, Oxfordian Shuqra Formation, Callovian Kohlan Formation, ?M. Jurassic Kohlan Volcanics, ? Jurassic Pre-Cambrian Unmetalled road Fig. 7 Geological map of Jebel Billum and Wadi Arus. EWA and WWA are the locations of the east and west
. Bulletin of the Natural Histort Museum. Geology series. 12 HOWARTH AND MORRIS. — $$$$$$- <^^^^ °o\° Q -i-i-i- -l-l- H - 1 —1 -1 - III N 1 1 ;m-i-i m s •;•;•;•; k Kv Quaternary Tertiary (Palaeocene, Eocene) Cretaceous, post-Qishn Formation Qishn Formation, U. Hajar Formation, U. Tithonian Naifa Formation, U. Madbi Formation, Oxfordian Shuqra Formation, Callovian Kohlan Formation, ?M. Jurassic Kohlan Volcanics, ? Jurassic Pre-Cambrian Unmetalled road Fig. 7 Geological map of Jebel Billum and Wadi Arus. EWA and WWA are the locations of the east and west cliffs in Wadi Arus of Figs 13, 15, 16; WJB is the western road entrance to Jebel Billum; CJB is the main Jurassic cliff section of central Jebel Billum, photographed from the western entrance in Fig. 8, and in detail in Fig. 10; PC (Perisphinctid Cliff) is the long cliff (shown in Fig. 11) with perisphinctids low in the Billum Member at its base; EJB (Eastern Jebel Billum) is (he section on the north side of the road where it first enters eastern Jebel Billum, depicted in the upper half of Fig. 12; SM is the exposure of the Shuqra and Madbi Formations in east Jebel Billum, 1 km SW of the Perisphinctid Cliff. cliff access can be gained to the Kilya/Arus contact, where it is seen to be an angular unconformity, the irregular bottom of the Arus Member cutting down into the eroded top of the Kilya Member. Access can also be obtained here to the scattered boulders in this bottom bed and to the main m thick bed of boulders. A rich basal Upper Tithonian ammonite fauna was obtained from these boulders (Fig. 17), mainly from m bed of large microbialite boulders, but the same ammonites also occur in the smaller boulders that are scattered through the bed below down to the base of the Arus Member. The whole ammonite fauna is new to Yemen, and includes the remarkable discovery of two large examples of the boreal ammonite Riasanites rjasanensis (Lahusen), the only rec
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Keywords: ., bhlconsortium, bookcentury1900, bookcollectionbiodiversity, bookl
