| Substrate Origin | Biogenic Substrate |
| Substrate Class | Worm Substrate |
| Substrate Subclass | Serpulid Substrate |
| Substrate Group | Serpulid Reef Substrate Serpulid Rubble Serpulid Hash |
| Definition | Biogenic substrate layers with conglomerated structures or broken particles that are primarily composed of cemented calcareous worm tubes produced by serpulid worms, e.g., Serpula. |