Data for: Size variations and abundance patterns of calcareous nannofossils in mid Barremian black shales of the Boreal Realm (Lower Saxony Basin)

Supplementary data for the manuscript: "Size variations and abundance patterns of calcareous nannofossils in mid Barremian black shales of the Boreal Realm (Lower Saxony Basin)" Including: Size and abundance data of the Frielingen 9 core; size date of the A 39 section; d13C data of the Frielingen 9 core; statistical test results本数据集为手稿《北域（Boreal Realm，下萨克森盆地（Lower Saxony Basin））巴列姆阶（Barremian）中部黑色页岩中钙质超微化石（calcareous nannofossils）的粒径变化与丰度分布模式》的补充数据，包含以下内容：弗里林根9号岩芯（Frielingen 9 core）的粒径与丰度数据、A39剖面（A 39 section）的粒径数据、弗里林根9号岩芯的d13C数据，以及统计检验结果。