11. The volcanogenic material was metamorphosed to leptynites and amphibolites . 12. The graptolite-bearing shales were later metamorphosed into lower amphibolite facies slates. 13. The defomration associated with the orogeny can be seen in amphibolite facies metamorphism. 14. At the veins in amphibolites and ultramafic rocks. 15. The metasedimentary rocks are quartz-rich and the amphibolites represent mafic igneous intrusions. 16. Prehnite-pumpellyite facies to mid-amphibolite facies have been produced by metamorphism. 17. Mineral chemistry and thermobarometry of a southern Appalachian amphibolite with epidote + quartz symplectite. 18. The land is composed of paragneiss of amphibolite and orthogneiss dated 1 billion years. 19. It is the principal mineral of amphibolites . 20. Some show granulite facies metamorphism, but most are the slightly lower temperature amphibolite facies.
