Table 2.
Infrared peak assignments for the fossil microbodies and a melanin standard (Sepia officinalis)
| Notation in Fig. 3 | Bond | Wavenumber (cm−1) | Mode of vibration | Melanin standard | Fossil microbodies |
|---|---|---|---|---|---|
| 1 | O‐H | 3200–3207 | Stretch | X | X |
| 2 | C=O | 1606–1620 | Stretch | X | X |
| 3 | O‐H ± N‐H | 1290–1315 | Bend | X | X |
| 4 | C‐H (aromatic) | 775–780 | Bend | X | X |
| * | C‐H (aliphatic) | 2920 | Stretch | – | X |
| ** | C=O (ketone) | 1713 | Stretch | – | X |
| † | C‐H (aliphatic) | 1428 | Bend | – | X |
| ‡ | C‐S ± C‐O | 1040 | Stretch | – | X |
| ◦ | C=S | 1152 | Stretch | – | X |
| ● | C‐S | 598 | – | – | X |
Numbers and symbols refer to Fig. 3.