Late Campanian and Early Maastrichtian ammonites from the white chalk of Kronsmoor (northern Germany) – taxonomy and stratigraphy
Late Campanian and Early Maastrichtian ammonites from the white chalk of Kronsmoor (northern Germany) – taxonomy and stratigraphy
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来自克朗斯莫尔（德国北部）白色粉笔的坎帕尼亚晚期和马斯特里赫特早期菊石 - 分类学和地层学
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发表时间：
2003
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通讯作者：
B. Niebuhr
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作者：
B. Niebuhr
Hypophylloceras（Neophylloceras）velledaeforme（SCHLUTER，1872），Anagaudryceras lueneburgense（SCHLUTER，1872），Saghalinites wrighti BIRKELUD，1965，Pachydiscus（Pachydiscus）neubergicus（VON HAUER，1858），Menuites cf. wittekindi（SCHLUTER，1872），Diplomoceras cylindraceum（DEFRANCE，1816），Baculites vertebralis LAMARCK，1801，Baculites knorrianus DESMAREST，1817，Baculites knorrianus tridens（KNER，1848），和Hoploscaphites constrictus（J. SOWERBY，1877）首次在德国北方唯一连续的坎帕尼亚-马斯特里赫特阶边界序列Kronsmoor中被描述。结合在Hemmoor（Kronsmoor西南30公里处）的稍微年轻的部分，迄今为止已知有13种菊石来自马斯特里赫特阶。研究的标本包括从上坎帕尼亚阶Belemnitella langei到下马斯特里赫特阶Belemnella sumensis带的物种，其中有三个物种（Baculites vertebralis，Baculites knorrianus，Hoploscaphites constrictus）在这里出现较早（例如，丹麦）。菜单cf. wittekindi，以前只知道从Nostoceras polyplocum带（上坎帕尼亚），发生在Belemnella lanceolata带在Kronsmoor。Pachydiscus neubergicus和Diplomoceras cylindraceum是Tercis的Maastrichtian（GSSP，法国西南部）基底的12个标记中的两个，它们首次出现在Kronsmoor，明显高于Belemnella lanceolata，该阶段基底的Belemnite标记。与Tercis相比，建议在两种菊石的FO之间建立阶段边界，Kronsmoor的Campanian - Maastrichtian边界似乎位于Belemnella pseudobtusa带内。因此，Belemnella属的第一次出现是在坎帕尼亚晚期，出现在c.比特尔西斯GSSP定义的马斯特里赫特阶底部早540 ky。
Hypophylloceras ( Neophylloceras ) velledaeforme (SCHLUTER, 1872), Anagaudryceras lueneburgense (SCHLUTER, 1872), Saghalinites wrighti BIRKELUND, 1965, Pachydiscus ( Pachydiscus ) neubergicus (VON HAUER, 1858), Menuites cf. wittekindi (SCHLUTER, 1872), Diplomoceras cylindraceum (DEFRANCE, 1816), Baculites vertebralis LAMARCK, 1801, Baculites knorrianus DESMAREST, 1817, Acanthoscaphites tridens (KNER, 1848), and Hoploscaphites constrictus (J. SOWERBY, 1877) are described for the first time from Kronsmoor, the only continuous Campanian-Maastrichtian boundary succession of northern Germany. Combined with the slightly younger section at Hemmoor (30 km SW of Kronsmoor), thirteen ammonites species in all are known to date from the Maastrichtian. The material studied comprises species from the Upper Campanian Belemnitella langei to the Lower Maastrichtian Belemnella sumensis zones. Three species ( Baculites vertebralis , Baculites knorrianus , Hoploscaphites constrictus ) occur earlier here than elseswhere (e.g., Denmark). Menuites cf. wittekindi , formerly known only from the Nostoceras polyplocum Zone (Upper Campanian), occurs in the Belemnella lanceolata Zone at Kronsmoor. Pachydiscus neubergicus and Diplomoceras cylindraceum , two of twelve markers for the base of the Maastrichtian at Tercis (GSSP, southwestern France), have their first occurrences at Kronsmoor significantly above that of Belemnella lanceolata , the belemnite marker for the base of the stage. Compared with Tercis, were the stage boundary was recommended between the FOs of both ammonite species, the Campanian – Maastrichtian boundary at Kronsmoor seems to be located within the Belemnella pseudobtusa Zone. Thus, the first occurrence of the genus Belemnella is of Late Campanian age, appearing c. 540 ky earlier than the base of the Maastrichtian as defined at the GSSP at Tercis.