Carbon and nitrogen stable isotope analysis of hunter-gatherers from the Coleman site, a Late Prehistoric cemetery in Central Texas

► Isotopes from Central Texas burial data show increasing C3 plant use from 6900 to 700 years BP. ► Carbon isotopes in bone apatite from burials at the post-700 BP Coleman site show a significant shift to C4/CAM plants. ► Coleman protein sources show a dependence on C3 fauna (e.g., deer), with use of high nitrogen fauna (e.g., fish) by males. ► Potential subsistence diversity and complex patterns of mate exchange are suggested for Late Prehistoric hunter-gatherers.