| Group I | Group II |
| P. Stylolite | 1. Liquefaction |
| Q. Pseudonodule | 2. Diagenesis |
| R. Current crescent | 3. Organo-sedimentary binding |
| S. Stromatolite | 4. Scouring |
Stylolite forms during Diagenesis (P– 2).
Pseudonodule forms as a result of Liquefaction (Q– 1).
Current crescent forms due to Scouring (R– 4).
Stromatolite forms due to Organo-sedimentary binding (S– 3)