JURASSIC AND LOWER CRETACEOUS OF WADI HAJAR 



Jebel Billum, western entrance road cutting 



(N14°18'48" E48°25'53") 



Naifa Formation, Billum Member: 



Argillaceous limestone, ca. 20 m above base. Ammonites: 



Glochicems (G.) subclausum (Oppel) [5]; Orthosphinctes 

 polygymtus (Reinecke) [I]. Bivalves: Indogrammatodon 

 egertouiamts (Stoliczka) [3], Nannogyra fourtmti (Stefanini) 

 [many]. 

 Limestone, in basal 5m. Ammonite: Pan'phoceras gravi (Spath) 

 [1]. 



Wadi Arus, road gorge leading into southern end of 

 Wadi 



Hajar Formation, Mintaq Member: 



Limestone, 16 m below Qishn Formation.Ammonite: Aspidocercis 



sp. indet. (photograph of 0.5 m diameter specimen). 

 Flaggy limestone, 31.5 m below Qishn Formation. Ammonites: 



Substeueroceras striatus sp. nov. [27]; Protacanthodiscus. sp. 

 indet. [4]. 



Wadi Arus, cliffs on east and west sides 



Hajar Formation, Arus Member: 



Microbialite boulders in basal 7m. Ammonites: Pseudoclambites 

 araense sp. nov. [18], Baeticoceras morrisi sp. nov. [2], 

 Virgatosimoceras broil ii ( Schneid) [ 1 ] , Aulacosphinctes spitiensis 

 (Uhlig) [1], Aulacosphinctes natricoides (Uhlig) [2], 

 Micracanthoceras fraiidator (Zittel) [1], Himalayites sp. indet. 

 [1], Spiticeras gregoiyi (Spath) [1], Virgatosphinctes cf. broilii 

 (Uhlig) [ l],Berriasella (B. )cf. oxycostata Mazenot [l]Miasanites 

 rjasanensis (Lahusen) [2], Blcmfordiceras wallichi (Gray) [1]. 

 Fchinoid: Colly rites cf. loryi (Gras) [1]. 



Wadi Arus, cliff on east side (N14°20'17" 

 E48°23'34") 



Naifa Formation, Kilya Member: 



Astarte Bed, 0.3 m below top. Bivalves: Neocrassina spitiensis 

 (Stoliczka [sensu Holdhaus]) [40]. 



Breadloaf Concretions, in marls 15-20 m above lowest expo- 

 sure. Ammonites: Taramelliceras (T.) pseudoflexuosum (Favre) 

 [2]. Taramelliceras (T.) cf. insistens Holder [4], Haploceras 

 staszycii (Zejszner) [8]. Glochiceras (Lingulaticeras) 

 pseudocarachteis (Favre) [4], Torquatisphinctes naifaensis sp. 

 nov. [1], Sutneria weidmanni Zeiss [7]. Pachysphinctes 

 bathyplocus (Waagen) [5], Pachysphinctes major Spath [5], 

 Idoceras ahwarense sp. nov. [1], Idoceras cf. balderum (Oppel) 

 [1], Nebrodites hospes (Neumayr) [1], Simaspidoceras 

 argobbae (Dacque) [8], Laevaptychus [6], Lithacoceras 

 (Subplanites) mombassanum (Dacque) [2], Lithacoceras sp. 

 indet. [1]. Bivalves: Parainoce ramus sp. [2], Aulacomyella 

 farquharsoni Cox [15], 'Posidonia' somaliensis Cox [many], 

 Liostrea cf. boloniensis de Loriol [1]. 



Wadi Arus, cliff on west side (N 14°20'29" 

 E48°23'30") 



31 



Naifa Formation, Billum Member: 



Top bed of limestone forming pavement at base of cliff. Ammo- 

 nites: Sirehlites plicodisciis (Waagen) |4 photographs]; indet. 

 perisphinctids ClTorqiiatisphinctes) [6 photographs]. Bivalves: 

 Parainoceramits sp. [few]. 



Mintaq Salt Dome; southwestern exposure leading 

 up to contact with Qishn Formation (N14°33'09" 

 E48°02'35") 



Qishn Formation: 



73 m above base, Orbitolina Limestone. Echinoid: Leptosalenia 

 somaliensis Hawkins [2]. Bivalves: Amphidonte sp. [2], 

 Plioladomya valangiensis Pictet & Campiche [l|. Gastropod: 

 IPseudomelania sp. [1]. 



38-46 m above base, Lower Oyster Beds. Bivalves: Lithophaga 

 sp., 'Exogyra' cf. tuberculifera Koch & Dunker [many], Trigonia 

 sp. [1], Syriotrigonia picteti (Coquand) [1], Opis sp. [1], 

 ITendagiirium sp. [1]. Gastropods: 'INerinella sp. [6], 

 Proceritliium sp. [1]. 



Hajar Formation, Mintaq Member (metres above base in 

 brackets are above the contact with the Sabatayn Formation): 



Bed 149 (8.5 m limestones and marls; 150.0 m above base), 0.75 

 m above base. Ammonites: IProtacanthodisciis or 

 Neocosmoceras spp. indet. [Ij; INeocomiies sp. indet. [1]. 



Bed 96 (0.3 m limestone; 113.35 m above base). Ammonites: 

 Dalmasiceras sp. indet. [2]. 



Bed 77 (0.2 m limestone with haemetite; 103.85 m above base). 

 Ammonites: Spiticeras (S.) pricei sp. nov. [1]. 



Bed 75 (0.3 m brown limestone; 103.45 m above base). Ammo- 

 nites: Spiticeras (S.) pricei sp. nov. [4]; Bcrriasella sp. indet. [1]. 



Bed 69 (0.2 m brown limestone; 101.55 m above base). Ammo- 

 nites: Haploceras umhilicatum sp. nov. [1], Spiticeras (S.) pricei 

 sp. nov. [6], Spiticeras subspitiense (Uhlig) [1], indet. berriaselJid 



[1]. 



Bed 64 (0.5 m brown, fine-grained limestone nodules; 99.55 m 

 above base). Ammonite: Argentiniceras mintaqi sp. nov. [1]. 



Bed 60 (0.35 m fine-grained brown limestone with abundant 

 haemetite nodules; 98.0 m above base). Ammonites: 

 Aspidoceras cf. taverai Checa [2], Spiticeras (S.) pricei sp. nov. 

 [41], Spiticeras sp. indet. [IJ, Berriasella (Elenaella) sevenieri 

 (Le Hegarat) [1], Berriasella (Picteticeras) chomeracensis 

 (Toucas) [ 1 ], Berriasella spp. indet. [6], Substeueroceras koeneni 

 (Steuer) [1], Argentiniceras mintaqi sp. nov. [1]. 



Bed 57 (0.3 m limestone; 97.2 m above base). Ammonites: 

 Haploceras umhilicatum sp. nov. [2], Aspidoceras cf. taverai 

 Checa [1], Argentiniceras mintaqi sp. nov. [2], Argentiniceras 

 mutatum{SleueT)[\]. Spiticeras up. indet. [ I ]. Echinoid: Collyrites 

 cf loryi (Gras) [2]. 



Bed 36 (0.2 m brown limestone; 90.4 m above base). Ammonites: 

 Aspidoceras rogoznicense (Zejszner) with Laevaptychus attached 

 [2], Spiticeras (S.) pricei sp. nov. [4], Spiticeras (S.) sp. (thick, 

 quadrate whorls) |l], Spiticeras (S.) sp. (compressed whorls, 

 involute) [ I \,SpiticerasfNegreliceras)obliquenodosuni{Rc\.owski) 

 [\\, Berriasella (Elenaella) sevenieri {LeHcg-dn\l)\\ l.Malbosiceras 

 sp. indet. [1], BerriaseJlid s.l., microconch or deformed 1 1 ]. 

 Argentiniceras mintaqi sp. nov. [ I ], Neocosmoceras sp. indet. 1 1 1 



Bed 34 (0.3 m grey-brown limestone; 90.0 m above ba.se). Am- 

 monites: Spiticeras (S.) subspitiense (Uhlig) [I]: Spiticeras (S.) 

 pricei sp. nov. [I]. 



