Appendicolith classification and physical characteristics. Appendicolith weight, maximum length and diameter are expressed as mean (range)
| Appendicolith class | Description | Occurrence n/41 (%) | Weight (mg) | Maximum length (mm) | Maximum diameter (mm) |
| Class 1 | Clear form, but soft faecal-like structure. Cross-sectionally amorphous. No visible core. | 17 (41.5) | 243 (11–816) | 9.9 (4–20) | 6.3 (2–9) |
| Class 2 | Firm to hard surface. Cross-sectionally concentrically layered structure. Visible core. | 16 (39.0) | 589 (19–1600) | 12.6 (4–22) | 8.0 (3–13) |
| Class 3 | Stony hard outer surface. Cross-sectionally concentrically layered structure. Visible core. | 8 (19.5) | 646 (15–2985) | 10.9 (6–19) | 7.2 (3–14) |
Maximum diameter of the appendicolith is the vertical measure of the maximum length.