K-Pg chondrichthyan assemblages from Maryland: Palebiogeographical significance and conservation needs [Data set used for clustering analysis in PAST]

We downloaded all occurrences of Campanian-Paleocene chondrichthyans from The Paleobiology Database (>3,000 records) and converted this to a presence-absence matrix consisting of 198 localities and 113 genera in Excel.We then added 24 localities from the literature representing chondrichthyan faunas from Campanian-Paleocene localities, particularly those relevant to the K-Pg (latest Maastrichtian, early Danian), and ensuring that the Severn Formation was represented by multiple localities, not just lumped into a single geological unit..We then added data from our site. The final matrix consisted of 223 localities x 113 genera.The data set was analyzed in PAST 4.03 (Hammer et al., 2001) using paired grouping and single linkage clustering analyses.

我们从古生物学数据库（Paleobiology Database）获取了坎潘期-古新世软骨鱼类（Chondrichthyes）的全部出现记录（共计超3000条），并在Excel中将其整理为包含198个采样点、113个属的出现-缺失矩阵。随后我们从文献中补充了24个采样点的相关数据，这些数据对应坎潘期-古新世的软骨鱼类群，尤其涵盖与K-Pg界线（晚马斯特里赫特期、早达宁期）相关的采样点，并确保塞文组（Severn Formation）以多个独立采样点体现，而非仅被合并为单一地质单元。之后我们补充了本研究采样点的实测数据。最终的矩阵涵盖223个采样点与113个属。本数据集采用PAST 4.03（Hammer等，2001）进行分析，运用了配对分组分析与单链接聚类分析方法。