Geochemical fingerprints of dated bentonites to constrain correlations in Cretaceous fluvial strata, Dinosaur Provincial Park, Alberta, Canada

Researchers have identified unique geochemical fingerprints and physical traits in bentonites from the Campanian-aged Dinosaur Park Formation (DPF) in Dinosaur Provincial Park, Alberta, Canada. These fingerprints enable precise correlation of fluvial strata without the need for radiometric dating, addressing longstanding challenges in stratigraphic correlation, sedimentation rate determination, and quantification of stratigraphic completeness. The study demonstrates that bentonites can be correlated over significant distances, such as the Plateau Tuff bentonite, which was traced across 12 km within the UNESCO World Heritage Site. Additionally, three previously unrecognized bentonites were identified, promising to enhance geochronological resolution in the region. This breakthrough offers a robust framework for resolving stratigraphic issues in fluvial systems and provides a model applicable to other similar environments.

Thompson, M. G. W., Durkin, P. R., Brown, C. M., Camacho, A., & Brink, K. S. (2026). Geochemical fingerprints of dated bentonites to constrain correlations in Cretaceous fluvial strata, Dinosaur Provincial Park, Alberta, Canada. Journal of Sedimentary Research, 96(2), 396–412. https://doi.org/10.2110/jsr.2025.107