JURASSIC AND LOWER CRETACEOUS OF WADI HAJAR 



29 



INeocrassina sp. [1]. Gastropods: IDiscotectus sp. [1], "Turbo' 

 sp. [1], I'Neritopsis' sp. [IJ. 



Naifa Formation, Billum Member: 



Central part. Bivalves: Falcimytilus jurensis (Roemer) [1], 

 Actinostreon soUtaria kindopeensis (Cox) [6]. 



Jebel Billum, long eastern Jurassic cliff, 

 Perisphinctid Cliff (N14°18'19" E48°28'35 ") 



Naifa Formation, Billum Member: 



Limestone pavement, 7 m above base. Ammonites: Paryphoceras 

 grayi (Spath) (photo only) [1 ], Larcheria gredingensis (Wegele) 

 [4, including 1 as photo only]. Orthosphinctes polygyratus 

 (Reinecke) [19, including 9 as photos onlyj, Idoceras ahwarense 

 sp. nov. (loose, ?fallen from higher in Billum Member) [1], 

 Euaspidoceras sp. indet. (photo only) [1]. 



Microthyridina Beds, 4 m and 9 m above base. Brachiopods: 

 Kallirhynchia sp. [3], Somalirhynchia cf. arabica Cooper [4], 

 Microthyridina farquharsoni Muir-Wood [50]. Echinoid: 

 Pseudocidaris aff. thunnanni (Agassiz) [1]. Crinoid: 

 IMillericrinus sp. [1]. Bivalves: Falcimytilus jurensis (Roemer) 

 [1], Indogrammatodon ege rtonianus (StoUczka) [3], Camptonectes 

 sp. [2], ILimaria sp. [1], IDeltoideumdelta (Smith) [Ij^Nannogyra 

 fourtaui (Stefanini) [1], Actinostreon solitaria kindopeensis (Cox) 

 [1], Trigonia sp. [3], Colpomya sp. [8]. 



Jebel Billum, east end, 1 km south-west of 

 Perisphinctid Cliff (N 14° 18'06" E48°28'22") 



Shuqra Formation: 

 Middle Shuqra: 



Lower part. Bivalves: 'Brachidontes' somalicus Cox [2], 

 Pholadomva ?ovalis (J. Sowerby) [1]. Gastropod: Ampullospira 

 sp. [1]. 



Loose. Bracbiopods: Somalirhynchia arabica Cooper [19], S. 

 subcircularis Cooper [8]. 



Loose, mixed Lower/Middle Sbuqra. Brachiopods: Conarosia 

 sp. [4], Daghanirhynchia sulcata Cooper [15], Daglumirhynchia 

 sp. [5%].BihenitliyrisbihenensisMu\x-^ood[21i\,B.mediocostata 

 Cooper [4], Dorsoplicathyris sp. [13], TStiphrothyris" sp. [14]. 

 Ecbinoid: Acrosalenia (Recrosalenia) somaliensis Currie [1]. 

 Bivalves: Grammatodon sp. [1], 'Brachidontes' somalicus Cox 

 [9], Modiolus cf. bipartitus J. Sowerby [1], Eligmus sp. [1], 

 Spondylopecten cf subpunctatus (Miinster) [1], Eopecten cf. 

 aubreyi (Douville) [1], Plagiostoma ?harronis Dacque [1], 

 I'Gryphaea' balli (Stefanini) [1], Actinostreon solitaria (J. 

 Sowerby) [1], INeocrassina sp. [1], Procyprina hunti (Cox) [2], 

 lEocallista krenkeli Cox [1], Ceratomyopsis somaliensis (Weir) 

 [16], ITellurimya 1%^. nov. [1], Pholadomya ?ovalis (J. Sowerby) 

 [1], Bucardiomya somaliensis (Cox) [3], Bucardiomya aubreyi 

 (Douville) [4], Ceratomya cf. pittieri (de Loriol) [2], C. cf 

 wimmisensis (Gillieron) [1]. Gastropods: Ampullospira_&p. [1]. 

 Nerinella sp. [4]. 



Lower Shuqra: 



Near base. Gastropods: Nerinella sp. [7]. 



Loose. Brachiopods: Conarosia rotundata Cooper [4], 

 Daghanirhynchia sulcata Cooper [18], Bihenithyris cf . bihenensis 

 Muir-Wood [12], TStiphrothyris" sp. [2]. Echinoid: Bothriopygus 



somaliensis (Currie) [1]. Stromatoporoid: Shuc/raia sp. [5]. 

 Corals [4]. Bivalves: Plagiostoma '.'luirronis Dacque [1], 

 Actinostreon solitaria (J. Sowerby) [2], 'Lucina' sp. [5], 

 IMactromya sp. [1], ITendagurium sp. |5], Bucardiomya cf. 

 lyrata (J. Sowerby) [2], Homomya cf. gibbosa (J. Sowerby) [3], 

 Ceratomya cf. pittieri (de Loriol) [ 1 ], IColpomya sp. [ 1 [.Gastro- 

 pods: Ampullospira sp. [3], INerinella sp. [4], 



Central Jebel Billum (south of main Jurassic cliff) 



(N14°19'00"E48°26'48") 



Madbi Formation: 



104.5 m above base (7.3 m below top). Bivalves: Indogrammatodon 

 egertonianus (Stoliczka) [4], Modiolus cf bipartitus J. Sowerby 

 [2], Nannogyra fourtaui (Stefanini) [4], Trigonia sp. [1]. 



87 m above base. Brachiopods: Somalirhynchia africana Weir [6], 

 So-nalithyris bihendulensis Muir-Wood [4], Somalithyris cf. 

 somcdiensis Weir [2]. Bivalves: Indogrammatodon egertonianus 

 (Stoliczka) sp. [3]. Nannogyra fourtaui (Stefanini) [20], 

 lActinostreon sp. [1], Trigonia sp. [1]. 



65.3-67.4 m above base. Brachiopods: Microthyridina 

 farquharsoni Muir-Wood [14]. Bivalves: Camptonectes sp., 

 ITrigonia sp., INeocrassina sp. [1]. 



Upper Storm Bed, 46—48 m above base. Brachiopods: Somali- 

 rhynchia arabica Cooper [7], Bihenithyris sp. [6], Microthyridina 

 farquharsoni Muir-Wood [22]. Bivalves: Indogrammatodon 

 egertonianus (Stoliczka) [5], Modiolus cf. bipartitus J. Sowerby 

 [2], 'Posidonia' somaliensis Cox [few], Eopecten sp., 

 IPlagiostoma sp. [few], Deltoideum delta (Smith) [ 1 %], Nannogyra 

 fourtaui (Stefanini) [AQ], Actinostreon aff. solitaria (J. Sowerby) 

 [3]. 



32-42 m above base. Brachiopods: Somalirhynchia africana var. 

 smelliei Weir [8], S. cf. arabica Cooper [6], Somalirhynchia sp. 

 [1], Avonothyris sp. [12], Bihenithyris sp. [11], Cerethyris sp., 

 [fragments, few], Mycerosia ?amygdaliformis Cooper [3], 

 Ptyctothyris daghanensis Muir-V^ood [1]. Bivalves: "Posidonia' 

 somaliensis Cox [1], Deltoideum delta (Smith) [1], Trigonia sp. 

 [1], Colpomya sp. [1]. 



Lower Storm Bed, at base of formation.Ammonite: Laevaptychus 

 [1]. Brachiopods: Somalirhynchia africana var. smelliei Weir 

 [4], S. cf. africana Weir [20], S. cf. arabica Cooper [38], 

 Somalirhynchia sp. (large, coarsely costate) [2], Bihenithyris 

 weiri Muir-Wood [2], Cererithyris cf. wyvillei (Weir) [4], 

 Ptyctothyris daghaniensis Muir-Wood [8], IRugetela sp. [2 frag- 

 ments]. Bivalves: Palaeonucula sp. [2], Indogrammatodon 

 egertonianus (Stoliczka) [26], 'Posidonia' somaliensis Cox [31], 

 Camptonectes sp. [2], Nannogyra fourtaui (Stefanini) [72], 

 Actinostreon aff. solitaria (J. Sowerby) [2], Trigonia sp. [1], 

 Neocrassina aff. unilateralis (J. de C. Sowerby) [4]. Gastropods: 

 Proconulus arabiensis (Newton) [17]. 



Shuqra Formation: 

 Upper Shuqra: 



1 m below top. Bivalves: IProcyprina sp. [20]. 



7-10 m below top. Brachiopods: Somalirhynchia fragments [15]. 

 Echinoids: Acrosalenia (Recrosalenia) somaliensis Currie [3], 

 IPlegiocidaris sp. [1]. Crinoids: lAngulocrinus sp. [2], 

 IMillericrinus sp. [2]. Bivalves: Nannogyra fourtaui (Stefanini) 

 [10], Actinostreon solitaria (J. Sowerby) |31. 



17 m below top, rubbly marls and nodular limestones. Ammo- 

 nite: Erymnoceras (Pacherymnoceras) jarryi (Douville) [I]. 



