The occurrence of Hemihaploceras schwageri (Neumayr, 1873) in the Upper Jurassic (Kimmeridgian, Beckeri Zone) of SW Germany and its stratigraphical significance
Abstract
The presence of the Tethyan ammonite species Hemihaploceras schwageri (Neumayr, 1873) is reported from the upper Kimmeridgian Obere-Felsenkalke Formation in the Upper Jurassic of SW Germany. The oppeliid genus Hemihaploceras Spath, 1925 occurs in two ammonite assemblages of the Beckeri Zone. The first one lies in the kiderleni Biohorizon within the Subeumela Subzone. The other one represents the herein newly introduced schwageri Biohorizon of the basal Setatum Subzone. Both ammonite assemblages comprises a mixture of Mediterranean and Submediterranean taxa accompanied by very rare taxa of Subboreal origin. The phyletic relationships between H. schwageri and other species included in Hemihaploceras are discussed.Downloads
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