| Clue | Source | Date |
|---|---|---|
| Sedimentary rock made up of angular rock fragments | The Times Specialist Sunday | 26 Jul 2026 |
| Sharp fragments embedded in a matrix of rock (7) | ||
| Rock band at first visits sports area with spies | The Guardian Cryptic | 20 Feb 2023 |
| Type of rock | The Times Concise | 31 Oct 2017 |
| A composite rock. |