203 



Oxfordien 



or 



Oxford 



Clay. 



OxpoKDiEN = Oxford Clay. 



I. — Marnea superieures a grandes Ammonifea 

 plicatilis, ot Pholodoinya jMrctcosta. 

 II. — Culcaires pseudo-lithographiquea a Phola- 

 domija ariipla, Ammonites Buheanua, 

 III. — Marnes Oxfordiemies inferieures grises, et 

 calcaires gris cendres a Spongiares ct 

 Ammonites biplex, and Amm. plicatilis. 

 TV. — Marnes ferrugineuses oolithiques a Ammo- 

 nites cordatus, Amm. perarmatus, Amm. 

 oculatus. 

 V. — Marnes Calloviennes et calcaires mamcux 

 a Ammonites athleta, Amm. lunula, 

 Amm,. Buncani, Plwladomya lineata, 

 Poladomya decussata, CoUyrites elliptica. 



I. — The marnes calloviennes et calcaires mameux, which 

 represent the Kelloway rock at the base of the Middle Oolites 

 of England, consist of marls and limestones of variable hard- 

 ness and with an earthy fracture. The terrain has a rnsty 

 yellowish colour above, and is bluish, greyish, or blackish 

 below, having a large quantity of oolitic iron disseminated 

 throughout. Judging from the number of specimens in M. 

 Martin's cabinets it must be a highly fossiliferous formation. 

 The following is a list of the more common forms noted by 

 me : — 



Cephalopoda. 

 Ammonites calloviensis, Soiu. Nautilus hexagonus, Soio. 



'I macrocephalus, Schloth. 



" anceps, Eeinecke. 



II Bakerige, Sow. 



II modiolaris, LlwTiyd, 



Belemnites hastatus, Blain. 



Am.nionites Duncani, Sow. 

 II lunula, Ziet. 



II atUeta, Phil. 



II coronatus, Brug. 



II bipartitus, Ziet. 



Gryphsea dilatata, Smv. 

 Ostrea Marsliii, Sow. 

 II gregarea, Sow. 



CONCHIFERA. 



Pecten fibrosus, Sow. 

 II vagans, Soiu. 

 Isocardia tenera, Pliil. 



Bkachiopoda. 



Terebratiila bicanaliculata, d^ Orb. 

 " lagenalis, ScMotJi. 



II Smithii, Oppel. 



Terebratula caUoviensis, d'Orl. 



II pala, von Buck. 



Rhynchonella Eoyeriana, d'Orb. 



