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Callidiscus zones (which correspond with the whole TV. pachydicranus zone). C O M P A N Y (1987) observed that TV. ) callidiscus occurs above the LAD of O. gaudryi in SE Spain, whilst A U T R A N (1993) figured an O. stevenini from a condensed horizon of the T. callidiscus and A. radi a tus (base of the Hauterivian) zones. 10 m in section B, I found on the surface of the bed an impression of a small neocomitid which surely belongs to the subgenus Teschenites (pl. 1, fig. 24). Due to its poor state of preservation it is difficult to reach a reliable determination; some characters of the ribbing recall TV.
The section studied is almost 30 metres thick, although it is partly covered (Fig. 3). The most fossiliferous levels are exposed from metre 30 to metre 23. In this part of the section the limestone flakes off in thin layers which often contain well preserved aptychi and crushed ammonites. S. verrucosum ( D ' O R B I G N Y ) was found in these levels between metres 29 and 24 but it has not been rediscovered during the last study. The distribution of those ammonites collected bedby-bed is shown in Fig.
It has been identified as O. sp. aff. stevenini ( N I C K L È S ) because the smooth stage persists much later than in the other species described by N I C K L È S (1892). 20 m I found a half whorl of a According to C O M P A N Y (1987), the range of N. Oosterella (pl. 20) specimen which is characterized neocomiensis spans the B. campylotoxus zone to the by a keel bordered by clear furrows and by the suture and base of the N. pachydicranus zone, whilst B U L O T (1993, the sculpture of O. 4) shows a longer range which begins at the top specimen figured by N I C K L È S (1892) pl.