The probe I saw is that the short article.did state whether the otolith sections, carbon dating, and isotope dating all agreed. I have seen studies of river sediments that had traces of many isotopes from early atom tests, so if buffalo or other fish or even floods are distubring the silt with the isotopes then I can see where it would be easy for fish to accumulate some of them in the otoliths. Maybe the concentrations might be lower than direct contact from being alive during those tests. I am not anti buffalo, they are a native fish and fed many a poor county family during tough times or maybe just served as an added food supply after floods. I have seen them trapped in sloughs in hay fields after the water receded by the hundreds. We're I a settler living on what I could grow or find, and a flood had just happened I certainly would be trying to can or salt them to preserve.