The rocks of the point are greenschist and mica-schist, formed by metamorphism of Devonian sediments during a period of mountain building towards the end of the Carboniferous period.
42.
The original 20 30 m thick Homestake Formation, has been deformed and metamorphosed, resulting in upper greenschist facies of siderite-phyllite, and lower amphibolite facies of grunerite schists.
43.
These sit on top of the Sierran basement, which beneath eastern Oroville comprise greenschist-facies metavolcanic rocks of Jurassic age, giving way to granites of the Sierra batholith to the east.
44.
The deposits show evidence of an Early Cretaceous, amphibolite facies event and a younger, mid-Cretaceous lower greenschist facies event which resulted from the accretion of the Yukon-Tanana Terrane.
45.
The "'Berlin Green Head "'is an ancient Egyptian statue head made from greenschist and housed in the Egyptian Museum of Berlin, not far from the Nefertiti Bust.
46.
Metamorphism at equal to, or higher than greenschist facies, will cause solid massive sulfides to deform in a ductile fashion and able to travel some distance into the country rock and along structures.
47.
Three major episodes of deformation and metamorphism were involved in the Aravalli Supergroup, including shearing, kink bands and crenulations etc . Metamorphic grades of the rocks generally range from greenschist facies to amphibolite facies.
48.
The geological composition of the mountains was formed in a region covered by an ancient sea that was a few hundred kilometers wide and are mainly made up of phyllite, greenschist, gneiss, slates and sandstone.
49.
More common is the Hercynian metamorphism, which is associated with regional and periplutonic metamorphism caused by intrusions of granitic rock, diapthoresis and low grade metamorphism of volcanosedimentary formations of several tectonic units to the greenschist facies.
50.
The original sedimentary succession transformed into migmatites at its base, followed by gneisses, micaschists and finally sericite schists and chlorite schists at the top, the schists at the top only being metamorphosed under greenschist facies conditions.
