1. All these minerals were altered during the greenschist facies retromorphism. 2. The greenschist , whose colour comes from harbour wall, are now closed. 3. The slates are highly cleaved and metamorphosed as high as lower greenschist facies. 4. They consist of interlayered sedimentary and volcanic flow rocks metamorphosed to low greenschist facies. 5. Incorporated at the base of the greenschist are limestone lenses containing upper Silurian conodonts. 6. A shield is that part of the metamorphosed greenschist , amphibolite, and granulite facies. 7. Oligoclase is also found in metamorphic rocks formed under transitional greenschist to amphibolite facies conditions. 8. In greater detail the greenschist facies is subdivided into subgreenschist, lower and upper greenschist. 9. In greater detail the greenschist facies is subdivided into subgreenschist, lower and upper greenschist . 10. The greenstone belts of the various archean cratons are commonly altered to the greenschist facies. 
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