Advances in Jurassic Research 2000. Proceedings of the Fifth

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Obtusum (Hillebrandt, 1 98 1 ). Stellare subzone: The highest resolution in terms of fauna! horizons for the Stellare Subzone is again known from the Dorset Coast where seven local units are distinguished (Page 1 992; 1 994). The base of the Stellare Subzone is only found in Dorset with the first Asteroceras gr. stellare (Sowerby) in the Galaticeras (now Bouhamidoceras, Page, 1 995) horizon. The upper part of the Stellare Subzone is known from Yorkshire and Burgundy, with correlation between these areas based on the presence of Aegasteroceras blakei (Spath) and Aegasteroceras sagittarium (Blake).

Fauna! Horizons Abstract: Based on Euroboreal and Alpine data we propose a new composite set of 41 ammonite fauna! horizons for the Upper Sinemurian. These are considered the most complete succession potentially correlatable. The sequence of horizons includes published information that is extended and improved for the Raricostatum, Macdonnelli, and Aplanatum Subzones. Introduction The present paper is part of a series dealing with correlations of ammonite faunas in terms of fauna! horizons for the Upper Sinemurian (Jura, Lias).

Vermiceras sensu stricto and Metophioceras are lacking. In the Late Hettangian, Complanata Subzone, Schreinbachites is relatively frequent in S W Germany (Bloos, 1 994) and also occurs i n eastern France (Guerin-Franiatte, 1 990: "Gyrophioceras", partim) and Luxembourg (Maubeuge, 1 987: "Gyrophioceras" praecursor). Specimens are also known from England near Bristol (Donovan, 1 952, pi. 29, Fig. 2) and from Dorset, together with Schlotheimia pseudomoreana (Page, 1 995). The latter occurrence, near the top of the Hettangian, indicates a major change also in the Arietitinae at the Hettangian/Sinernurian boundary.

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