Foraminiferal assemblages were studied as part of a multi-proxy dataset from an expanded record of Late Turonian hemipelagic deposition obtained from the Bch-1 research borehole in the Bohemian Cretaceous Basin (Central Europe). Based on fluctuations in the Si/Al ratio, precession-paced cyclicity (18–23 kyr) is recognized in the studied interval and interpreted to reflect changes in seasonality. This study focuses on relationships between the astronomically controlled lithological cyclicity and the composition of foraminifera assemblages, together with variation in other parameters (geochemical, geophysical, palynological) that may provide further information about palaeoenvironmental change on a precession time scale.

Spearman correlation enables the foraminiferal assemblages to be divided into three clusters. These clusters are interpreted to reflect palaeoenvironmental patterns that result from variation in nutrient supply and in surface water salinity, driven by changes in seasonality. The “Lenticulina – Gyroidinoides – agglutinated foraminifera” cluster dominated during periods of decreased seasonality and alternated with the “Cibicides – spiral unkeeled planktics” cluster (lower part of study interval) or the “Gavellinela – Praebulimina – spiral keeled + biserial planktics” cluster (upper part of study interval) coincident with the presumed seasonality maxima. Replacement of the Gavelinella cluster by the Cibicides cluster may reflect a longer-term trend of seasonality changes or changes in food supply.

The observed low foraminiferal abundance and low planktic/benthic ratio during the seasonality maxima indicates that these were times of more intense rainfall, increased clastic supply and surface water turbidity, and more pronounced salinity fluctuations.

有孔虫组合作为多代理数据集的一部分进行了研究，该数据集来自从波西米亚白垩纪盆地（中欧）的 Bch-1 研究钻孔获得的晚Turonian 半远洋沉积的扩展记录。基于 Si/Al 比率的波动，在研究的区间中识别出进动节奏的周期性 (18-23 kyr)，并对其进行解释以反映季节性的变化。本研究侧重于天文控制的岩性周期性与有孔虫组合组成之间的关系，以及其他参数（地球化学、地球物理、孢粉学）的变化，这些参数可能提供有关进动时间尺度上古环境变化的进一步信息。

Spearman 相关性使有孔虫组合能够分为三个集群。这些集群被解释为反映了由季节性变化驱动的养分供应和地表水盐度变化导致的古环境模式。“ Lenticulina – Gyroidinoides – 凝集有孔虫” 集群在季节性下降期间占主导地位，并与“ Cibicides – 螺旋浮游生物”集群（研究间隔的下半部分）或“ Gavellinela – Praebulimina –螺旋龙骨 + 双列浮游生物”集群交替出现（研究间隔的上部）与假定的季节性最大值一致。替换Gavelinella集群Cibicides集群可能反映季节性变化或食品供应变化的长期趋势。

在季节性最大值期间观察到的低有孔虫丰度和低浮游生物/底栖生物比率表明，这些时期降雨更加强烈，碎屑供应和地表水浊度增加，盐度波动更加明显。