In this paper we present the effects of different tracemakers on the redistribution of calcareous nannofossils throughout the K-Pg boundary at the Bidart section (SW France), along with their consequences for our knowledge of the K-Pg boundary event. Danian calcareous nannofossil assemblages are present in Maastrichtian samples due to infiltration into dark trace fossil infillings proceeding from the earliest Paleogene. This is evidenced by the appearance of abundant paleogene calcareous nannofossils just below the K-Pg boundary, showing the relevance of the trace fossil infillings in the context of the K-Pg boundary event.

中文翻译：

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跨越法国西南部 Bidart 的 K-Pg 边界的马斯特里赫特最上层大年钙质纳米化石的生物扰动再分布

在本文中，我们展示了不同示踪剂对 Bidart 部分（法国西南部）K-Pg 边界内钙质纳米化石重新分布的影响，以及它们对我们了解 K-Pg 边界事件的影响。由于从最早的古近纪开始渗入深色痕迹化石填充物，马斯特里赫特样本中存在大年钙质纳米化石组合。这可以通过在 K-Pg 边界下方出现丰富的古近系钙质纳米化石来证明，这表明在 K-Pg 边界事件背景下微量化石充填物的相关性。