AMMONITES AND NAUTILOIDS OF WADI HAJAR 



35 



Table 1 Ammonite zones of the Callovian to Berriasian Stages and the dates of the formations in Wadi Hajar. The zones in the Callovian and Lower and 

 Middle Oxfordian are the Euroboreal primary zones, while those in the Upper Oxfordian to Berriasian are the Submediterranean standard zones that are 

 appropriate to the Tethyan Province. The Callovian and Oxfordian Stages are based on Arkell ( 1956), Mouterde & Enay (1971: 16-21) and Cariou & 

 Hantzpergue (1997: 80, 84, 362), and the Kimmeridgian to Berriasian Stages on Howarth (1992: 599-601 ) and Cariou & Hantzpergue (1997). The 

 horizons of the dateable ammonite faunas in Yemen are shown by asterisks (*), followed by numbers which correspond to the ammonite faunas described 

 on pp. 101-103. 



STAGES 



AMMONITE ZONES 



MEMBERS 



FORMATIONS 



BERRIASIAN 



Fauriella boissieri 

 Timovella occitanica 

 Pseudosubplanites ewcinus 



*,3 Mintaq 



*11 



HAJAR 



TITHONIAN 



U 



Durangites 



Micracanthoceras microcanthum 



*10 



*9 Arus 



L 



Micracanthoceras ponti 

 Semiformiceras fallauxi 

 Semifonniceras semiforme 

 Neochetoceras darwini 

 Hybonoticeras hybonotum 



y///////////A 



Disconformity/unconformity // 



W//////////// 



*8 



Kilya 



NAIFA 



KIMMER- 

 IDGIAN 



U 



Hybonoticeras beckeri 

 Aulacostephanus eudoxus 

 Aspidoceras acanthicum 



*6 



*' Billum 



*4 



L 



Cmssoliceras divisum 

 Ataxioceras hypselocyclum 

 Sutneria platynota 



OXFORDIAN 



U 



Subnebrodites planula 

 Epipeltoceras bimammatum 

 Dichotomoceras bijurcatum 





=1=3 



MADBI 



*2 



M 



Gregoryceras transversarium 

 Perisphinctes plicatilis 



L 



Cardioceras cordatum 

 Quenstedtoceras mariae 



CALLOVIAN 



U 



Quensredtoceras lamberti 

 Peltoceras athleta 



*1 



SHUQRA 



M 



Erymnoceras coronatum 

 Reineckeia anceps 



L 



Sigaloceras calloviense 

 ProplanuUtes koenigi 

 MacrocephaUtes herveyi 



BATHONIAN 





KOHLAN 



Museum, London, while those with the prefix SM F. are in the 

 Sedgwick Museum, Cambridge. Whorl measurements are given in 

 the order: diameter (D), whorl height (Wh), whorl breadth (Wb), 

 umbilical width (U); numbers in brackets after Wh, Wb and U are 

 proportions of the diameter. The type species of genera were all fixed 

 by 'original designation', except when stated otherwise. The exact 

 horizons of the great majority of the ammonites described here are 

 shown on figs 2, 3, 5, 6, 12, 16, 18 and 20 of the preceding paper 

 (Howarth & Morris, 1998). Each ammonite figured in the plates is 

 related to its appropriate fauna as described on pp. 101-103. 



Order AMMONOIDEA Zittel, 1884 

 Suborder AMMONITINA Hyatt. 1889 

 Superfamily HAPLOCERATACEAE Zittel. 11 

 Family OPPELIIDAE Douville. 1890 

 Subfamily TARAMELLICERATINAE Spath. 



928 



Genus TARAMELLICERAS Del Campana. 1904 



Type species. Ammonites trachinotus Oppel, 1863. subse- 

 quently designated by H. Douville, 1879 [for Neumayria Bayle, 

 1878 (non De Stefani, 1877), for which Taramelliceras Del 



