Table 2.
Summary statistics and %C4 plants for bison bones and teeth within each episode.
| Episode (cal BP) | Tissue | n | Mean δ13C ‰ | SD δ13C ‰ | δ13C ‰ | Mean δ15N ‰ | SD δ15N ‰ | δ15N ‰ | % C4 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|
| low | high | low | high | ||||||||
| Modern | Dentin | 5 | −20.5 | 0.47 | −21.1 | −20.0 | 4.9 | 0.24 | 4.6 | 5.2 | 0 |
| Late Holocene (4,200 – 100) | Dentin | 25 | −18.3 | 1.57 | −20.5 | −15.1 | 6.7 | 0.85 | 5.0 | 8.3 | 14 |
| Bone | 18 | −19.0 | 1.67 | −21.1 | −14.8 | 6.6 | 0.94 | 4.9 | 8.1 | 9 | |
| Middle Holocene (8,200 – 4,200) | Dentin | 5 | −16.8 | 0.82 | −17.9 | −16.2 | 8.2 | 0.96 | 6.8 | 9.3 | 24 |
| Bone | 2 | −16.9 | 3.18 | −19.1 | −14.6 | 6.8 | 2.47 | 5.0 | 8.5 | 24 | |
| Early Holocene (11,700 – 8,200) | Bone | 1 | −18.2 | na | −18.2 | −18.2 | 6.6 | na | 6.6 | 6.6 | 14 |
| Late Pleistocene (12,500 – 11,700) | Dentin | 4 | −20.6 | 1.44 | −21.5 | −18.4 | 5.7 | 0.51 | 5.0 | 6.2 | 0 |