|mhorn||Дата: Saturday, 30.05.2015, 10:32 | Сообщение # 1|
|Pandey D.K., Alberti M., Fürsich F.T. (2015) Ammonites of the genera Peltoceras Waagen, 1871, Metapeltoceras Spath, 1931, and Euaspidoceras Spath, 1931 from the Upper Callovian and Oxfordian of Kachchh, western India // Journal of the Palaeontological Society of India. V.60. P.1-26. |
Members of the family Aspidoceratidae Zittel, 1895 dominate the ammonite assemblage of the Upper Callovian of the Kachchh Basin. With the appearance of the genus Perisphinctes Waagen, 1869 in the Early Oxfordian they lose their dominance, but still form a relatively diverse group. In the present study, 32 ammonites from the Kachchh Basin in western India have been assigned to 18 taxa belonging to the genera Peltoceras Waagen, 1871, Metapeltoceras Spath, 1931, and Euaspidoceras Spath, 1931.
Due to co-occurring ammonites as well as comparisons with European sections, most of these taxa can be attributed to West European ammonite zones, albeit significant differences between European and Indian ammonite successions in fact prevent to use European scale, and local succession of ammonite zones should be proposed further.
Middle Jurassic - Lower Cretaceous ammonites & aptychi