[7] Recent evidence from stable isotope analysis of Holocene fur seal bone collagen (δ13C and δ15N) indicates that before the maritime fur trade, it was more common for these animals to breed at local rookeries in British Columbia, California, and likely along much of the northwest coast of North America. (en.wikipedia.org)
Using osteobiography and paleopathology methods as well as stable isotope analysis and mass spectrometry on about 500 skeletons from the dairy - farming area, they have been able to reconstruct the group's diet, disease and overall health. (sciencedaily.com)
Because C4 plants concentrate more of carbon's heavier isotopes compared with C3 plants, a technique called stable isotope analysis — which measures the relative concentrations of isotopes in animal bones — can often detect which plants predominate in the diet. (sciencemag.org)