A multi-dimensional dataset of Ordovician to Silurian graptolite specimens for virtual examination, global correlation, and shale gas exploration - Xu, H.-H.; Niu, Z.-B.; Chen, Y.-S.; Ma, X.; Tong, X.-J.; Sun, Y.-T.; Dong, X.-Y.; Fan, D.-N.; Song, S.-S.; Zhu, Y.-Y.; Yang, N.; Xia, Q. (Earth Syst. Sci. Data, 2023)