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Additional resources for Advances in Jurassic Research 2000. Proceedings of the Fifth International Symposium on the Jurassic System. R.L. Hall and P.L. Smith (Eds.), GeoResearch Forum 6
Bed 1 58 (C 1 1 2): Vermiceras aff. quantoxense Bed 1 57 (C l I I ): Metophioceras sp. indet. D Bed 1 55 (C I 09): Vermiceras or Metophioceras sp. Bed 1 54 (C I OS): r o t a t o r B i o h o r i zo n (Page, 1 992) Bed 1 53 (C I 07): r o u v i l l e i B i o h o r i zon (Page, 1 995) Bed 1 52 (C I 06): r o t a r iu s B i o h o r i z o n (Bioos, 1 988a) Bed 1 5 1 (C I 05): Vermiceras or Metophioceras sp. Bed 1 49 (C I 03): c o n y b e a r o i d e s B i o h o r i z o n (Bioos, 1 988a) ( = "Metophioceras sp.
11:977- 982. 1 992a. Leptechioceras (Neomicroceras) Donovan, 1 966 (Ammonitina, . AND Echioceratidae, Sinemurien, Europe du Nord-Ouest): taxon progenetique ou microconque. Geobios, 25/4:477-493 . 1 992b. Late Sinemurian and Early Carixian ammonites in Europe with cladistic . AND analysis of sutural characters. Neues Jahrbuch ftir Geologie und Palaontologie, Abhandlungen, 185/2:2 1 1 -237. , __, AND F. B OHM. 1 995. New data on Austroalpine Liassic ammonites from the Adnet quarries and adjacent areas (Oberosterreich, Northern Calcareous Alps).
This rather variable species is characterized by dense, sigmoidal ribbing and rather narrow umbilicus. It occurs in the "Oolithenbank" of SW Germany and in eastern France (Guerin-Franiatte, 1 990, pi. 20, Fig. 2). The Complanata Subzone at Limekiln Steps is at least 1 6m thick; the true thickness may be greater because the lower boundary is not yet precisely located. The upper portion of the subzone, here indicated by S. ex gr. striatissirna, is extremely thin compared with SW Germany. Depressa Subzone (Ammonites see PI.