Metamorphism

Archean stretched boulder metaconglomerate, Wawa, Ontario, Canada	Proterozoic granite gneiss, CO	Aureole of hornblende around garnet in metagabbro, Gore Mountain, NY	Proterozoic banded iron formation, Jasper Knob, Ishpheming, MI
Close-up of folded banded iron formtion, Jasper Knob, Ishpheming, MI	Slate showing cleavage surfaces in quarry near Ferrisburg, VT	Slate in the Proterozoic Miette Group, Banff National Park, Alberta, Canada	Contact metamorphism between Purcell sill and Helena Fm., Glacier National Park, MT
Lit par lit structure in migmatite, White River, Ontario, Canada	Migmatite with well developed lit par lit structure, White River, Ontario, Canada	(META13) Proterozoic migmatite, White River, Ontario, Canada	Stretched quartz pebble conglomerate.
Slate in the Devonian Waits River Fm., Barre, VT	Banded Iron Formation with glacial striations, MI.