Fig. 3.

Isotope compositions of oxygen, nitrogen, and carbon in goose bones. (A) δ¹⁵N_Co and δ¹⁸O_W, and (B) δ¹⁵N_Co and δ¹³C_Co in goose bones found at the Tianluoshan site (adult: closed diamonds, immature: open diamonds) and the Kuahuqiao site (adult: red cross symbols). The gray area indicates the range in δ¹⁸O_W values (mean ± σ) in mammal bones from Tianluoshan. Note that the samples represented by the five symbols in the gray area are presumably from local individuals. The colored bars that represent δ¹⁸O_W values correspond to the same colors used in Fig. 1 for the oxygen isotope composition of annual precipitation.