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标题：Sanmartinoceras aff. walshense (ETHERIDGE, 1892) from the Early Cretaceous of California - the first evidence of the ammonite subfamily Aconeceratinae SPATH, 1923 in North America
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作者：Jens Lehmann ; Michael A. Murphy
期刊名称：Acta geologica Polonica
印刷版ISSN：0001-5709
出版年度：2000
卷号：50
期号：1
页码：119-124
语种：English
出版社：Institute of Geology, University of Warsaw
摘要：Sanmartinoceras aff. walshense (ETHERIDGE, 1892), a single large representative of the Aconeceratinae SPATH, 1923 from California is believed to be a macroconch. It shows close relations to Sanmartinoceras africanum KENNEDY & KLINGER, 1979 and Sanmartinoceras walshense, however the described combination of features is unique. Until the variability of this ammonite is established we assign this specimen to Sanmartinoceras aff. walshense. It is probably Late Aptian in age and represents the first evidence of the Aconeceratinae in North Americ.
关键词：Ammonoidea;Haploceratacea;Aconoceratide;Sanmartinoceras;Early Cretaceous;Northern California;Late Aptian .