| Substrate Origin | Biogenic Substrate |
| Substrate Class | Shell Substrate |
| Substrate Subclass | Shell Hash |
| Substrate Group | Clam Hash |
| Substrate Subgroup | Coquina Hash |
| Definition | Shell Hash (with a median particle size of 2 millimeters to < 64 millimeters) that is primarily composed of loose clam shells and shell bits. |