Search results for "Douvilleiceras"
showing 2 items of 2 documents
Report on the 4th International Meeting of the IUGS Lower Cretaceous ammonite working group, the "Kilian Group" (Dijon, France, 30th August 2010).
2011
8 pages; International audience; The 4th Kilian Group meeting (Dijon, France, 30th August 2010) focused on the Aptian and Albian Stages. For the Aptian, a two-fold division of the stage was adopted for the Mediterranean area with a boundary between the Dufrenoyia furcata and Epicheloniceras martini Zones. The main changes to the zonal scheme concern the Lower Aptian with: the introduction of a Deshayesites luppovi Subzone in the upper part of the Deshayesites oglanlensis Zone; the replacement of Deshayesites weissi by Deshayesites forbesi as new indexspecies of the second interval zone; the introduction of a Roloboceras hambrovi Subzone in the upper part of the D. forbesi Zone; and the subd…
Albian ammonites of the Benguela Basin (Angola): a biostratigraphic framework.
2007
20 pages; The study of the Albian ammonite fauna of the sedimentary series in the Benguela Basin (Angola) allows a major revision of the biostratigraphy of the south Atlantic area. The new biostratigraphic approach allows the recognition of 17 horizons distributed in 8 subzones correlated with the ammonite zonation of the Tethyan Province. The Lower Albian is characterized by the Douvilleiceras inaequinodum Subzone (including the D. mammillatum aequinodum Horizon). The Middle Albian is represented by the Oxytropidoceras (Mirapelia) buarquianum Subzone (subdivided into O. (M.) buarquianum and O. (M.) sergipense horizons). The Upper Albian is characterized by the Dipoloceras sp. Subzone (defi…