Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Histogram showing the carbon isotopic composition (δ13C value) of tooth enamel from Au. afarensis and all other mammalian taxa analyzed from the Hadar Formation. Black, Au. afarensis; gray, all other mammals analyzed. Data are from this study (hominin samples are in SI Appendix, Table S1, and other samples are in SI Appendix, Table S2, and in ref. 44).
