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Volgoceratoides and Koeneniceras - New Small-Size Lower Aptian Heteromorphs from the Ulijanovsk Region (Russian Platform)статья
- Авторы: Mikhailova I.A., Baraboshkin E.J.
- Журнал: Jahrbuch der Geologischen Bundesanstalt
- Том: 57
- Год издания: 2002
- Первая страница: 539
- Последняя страница: 553
- Аннотация: New stratigraphical and ammonite distribution data are given based on bed-by-bed fauna collecting in the Lower Aptian of the Ulijanovsk region (Volga River, Russian platform). Volgoceratoides and Koeneniceras – two new small-size heteromorph ammonites – are described as a result of revision. It is recognised that the ammonite taxa from the basal Lower Aptian of the Ulijanovsk region show great resemblance with North German sections. Two parallel zonal schemes, based on the development of the families Deshayesitidae and Ancyloceratidae, are offered. Those groups of ammonites occupied a different ecological position and therefore the schemes characterise different bathymetrical regions of the same basin.
- Добавил в систему: Барабошкин Евгений Юрьевич