Radiocarbon dating facilities
The variety of climatic proxies is greater than in any other natural recorder of climate, such as tree rings or sediment layers.These include (proxies for) temperature, ocean volume, precipitation, chemistry and gas composition of the lower atmosphere, volcanic eruptions, solar variability, sea-surface productivity, desert extent and forest fires.
This means that although they are very similar chemically, they have different masses.
For its details as to family lines, lands of occupation, life spans, and events should provide positive proof to even the most skeptical observers that its accounts are genuine and accurate, because no one would go into such minute detail if they were simply creating a forged document.
Oh, they could if they wished, but that would require a high level of sophistication and some very dark motives.
Example: analyzing changes in tree growth patterns via tree rings to date a series of landslide events.
The science that uses tree rings to date and study past and present changes in glaciers.