R. B. Morrison. “The Pleistocene-Holocene Boundary: An Evaluation of the Various Criteria Used for Determining It on a Provincial Basis, and Suggestions for Establishing It World-Wide”. Netherlands Journal of Geosciences (January 1, 1969): 363-371. Accessed November 4, 2026. https://njgjournal.nl/index.php/njg/article/view/15097.