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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/33167

Title: New Lower Kimmeridgian ataxioceratin ammonite from the eastern Iberian Chain, Spain: Systematic, biogeographic and biostratigraphic relevance
Authors: Moliner Oliveros, Luis
Olóriz Sáez, Federico
Issue Date: 2010
Abstract: New ammonites collected bed−by−bed from the upper part of Ataxioceras hypselocyclum Chronozone deposits in the eastern Iberian Chain are described as Geyericeras gen. nov. The new genus includes micro− and macroconchiate Ataxioceratinae of small size, with moderate to loose coiling and subpolyplocoid ribs, a character crucial for its identification. Key points for the comparative identification of Geyericeras gen. nov. are: (i) microconchiate Geyericeras show morphological convergence with evolute specimens of the stratigraphically older genus Schneidia [m]; (ii) contemporary Ataxioceratinae genera such as Ardescia [m, M] and Lithacosphinctes [m, M] did not develop subpolyplocoid ribbing; (iii) smoothing of sculpture combined with short primary ribs are not realized in Geyericeras gen. nov. [M] and can be therefore used to separate the new genus from Ataxioceras [M]; and (iv) smaller shells, and weaker and less dense ribbing with no parabolic structures differentiate Geyericeras gen. nov. [m, M] from Parataxioceras [m, M], as well as the type of subpolyplocoid ribs seen among microconchiate specimens of these two genera. The new species Geyericeras aragoniense sp. nov. is the index and guide fossil for identification of a biohorizon occurring below the first occurrence of the genus Crussoliceras in the eastern Iberian Chain.
Sponsorship: This research is a contribution to the IGCP project 506 and has been supported by Projects BTE2005−01316 and CGL2008−3007, and the EMMI Group RNM178 J.A., Spain.
Publisher: Instytut Paleobiologii PAN
Keywords: Ammonoidea
Geyericeras
Ataxioceratinae
Lower Kimmeridgian
Jurassic
Iberian Chain
Spain
URI: http://hdl.handle.net/10481/33167
ISSN: 0567-7920
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Moliner, L.; Olóriz, F. New Lower Kimmeridgian ataxioceratin ammonite from the eastern Iberian Chain, Spain: Systematic, biogeographic and biostratigraphic relevance. Acta Palaeontologica Polonica, 55(1): 99-110 (2010). [http://hdl.handle.net/10481/33167]
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