Metabasalt is typically composed of orthopyroxene, garnet, plagioclase, clinopyroxene, and quartz. These minerals are commonly found in the high-pressure, low-temperature metamorphic conditions where basalts undergo metamorphism
| Group I | Group II |
| P. Stylolite | 1. Liquefaction |
| Q. Pseudonodule | 2. Diagenesis |
| R. Current crescent | 3. Organo-sedimentary binding |
| S. Stromatolite | 4. Scouring |