Table 1.
Tissue growth rates determined from calibrated 14C ages
| Sample ID | Growth rate ± 2σ | Length, cm | Proximal 14C age | Distal 14C age | Time in tissue, y |
| Tail hair (keratin), mm/d | |||||
| TSV-171 | 0.81 ± 0.77 | 31.4 | 1996.7 | 1996.0 | 0.7 |
| R37 | NA | 2001.9 | 2002.5 | — | |
| Hippo canines (bioapatite), cm/y | |||||
| 2KL (upper) | 1.94 ± 0.31 | 17.0 | 1969.5 | 1964.2 | 8.8 |
| KL | 3.35 ± 0.25 | 37.2 | 1960.0 | 1970.6 | 11.1 |
| K11-KF | 4.51 ± 0.41 | 35.0 | 1979.0 | 1972.4 | 7.8 |
| K08-201 | 4.87 ± 0.34 | 56.0 | 2006.5 | 1996.8 | 11.5 |
| TSV-291 | 7.47 ± 0.88 | 60.0 | 1996.9 | 1989.6 | 8.0 |
| Elephant tusks (collagen), cm/y | |||||
| Misha | 5.11 ± 0.75 | 73.0 | 2008.7 | 1993.9 | 14.8 |
| R37 | 4.13 ± 0.39 | 115.6 | 2005.5 | 1978.1 | 28.0 |
| Elephant molar plates (bioapatite), cm/y | |||||
| TE-95 Rm6.2 | 1.49 ± 0.54 | 10.1 | 1959.3 | 1955.0 | 6.8 |
| TE-95 Rm6.4 | 1.46 ± 0.59 | 11.6 | 1959.7 | 1954.3 | 7.9 |
| TE-95 Rm6.7 | 1.63 ± 0.14 | 12.3 | 1963.1 | 1957.1 | 7.5 |
| TE-95 Rm6.9 | 1.62 ± 0.14 | 11.1 | 1963.9 | 1959.1 | 6.9 |
| R37 Lm6.7 | 1.39 ± 0.27 | 7.8 | 1984.2 | 1979.6 | 5.6 |
| R37 Lm6.10 | 1.61 ± 1.19 | 5.9 | 1988.4 | 1986.3 | 3.7 |
Total time represented in tissue is based on growth rate and length.