D. L. . Baars, C. A. Ross, S. M. . Ritter, and C. G. . Maples, “Proposed Repositioning of the Pennsylvanian-Permian Boundary in Kansas”, kgsbulletin, no. 230, pp. 5–10, Apr. 2024, Accessed: Jul. 03, 2024. [Online]. Available: https://journals.ku.edu/kgsbulletin/article/view/20480