11. The Torlesse Greywacke has undergone metamorphism and been transformed into Haast Schist. 12. Most likely these metagreywackes only have undergone a higher degree of metamorphism . 13. Its typical occurrence is in shales that have undergone low grade metamorphism . 14. Dating fractionating zonation thus help putting time constraint on metamorphism . 15. Frequently, rock formations that undergo orogeny are severely deformed and undergo metamorphism . 16. Conversely, decreasing temperatures and pressure characterize " retrograde metamorphism ". 17. The Roxbury Conglomerate has been significantly altered by metamorphism . 18. It has not undergone metamorphism and is often yellowish with visible embedded fossils. 19. Shock metamorphism in the Azuara impact structure include planar deformation features in quartz. 20. The batholith has caused metamorphism on its western edge.
