Calcareous nannofossils—very small‐scaled marine microfossils—occur in many archaeological materials. Foremost, these include limestones used in masonry, material which has not experienced significant modification by humans. Poorly documented are nannofossils in mortars, because the burning process of quicklime requires the heating of the raw material to > 800°C. Here we focus on calcareous nannofossils in mortar and mortar‐based samples of four medieval buildings in northern Germany. The study documents the presence of nannofossils in historic mortars. It supplies evidence for the provenance of the mortars used, thereby introducing a new tool for mortar provenance studies.

中文翻译：

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中世纪灰浆和灰浆基材料中的钙质纳米化石：一种强大的来源分析工具

钙质纳米化石（非常小的海洋微化石）发生在许多考古材料中。最重要的是，这些包括砖石中使用的石灰石，这种材料没有经过人类的重大改造。砂浆中的纳米化石记录很少，因为生石灰的燃烧过程需要将原料加热到> 800°C。在这里，我们重点研究德国北部四座中世纪建筑的灰泥和灰泥基样品中的钙质纳米化石。该研究记录了历史悠久的砂浆中存在纳米化石。它提供了所用砂浆来源的证据，从而为砂浆来源研究引入了一种新工具。