Biogenic substrata that is constructed from cemented/self-adhered non-living shells and shell fragments. These are typically (but not exclusively) molluscs. Living shells fauna may be present but these are described under the Biota Component.
Level 4 Definitions
- Clam Shell: Biogenic substrata dominated by clams.
- Mussel Shell: Biogenic substrata dominated by mussels.
- Other Shell: Biogenic substrata dominated by other shells.
- Oyster Shell: Biogenic substrata dominated by oysters.
- Screw Shell: Biogenic substrata dominated by screw shells.