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The fossil record's oldest known calculus (an enterolith of..:

Larkin, Nigel R. ; Henton, Thomas ; Etches, Steve...
Proceedings of the Geologists' Association.  134 (2023)  5-6 - p. 526-532 , 2023
Link: https://doi.org/10.1016/j.pgeola.2023.05.004