Abstract: The Çamlıca metamorphic association located on the western part of the Biga Peninsula covers an area of2about 196 km . The rock units of the Çamlıca metamorphic association are separated in  three units, which aredescribed as formations based on the partly determined internal structure, on contact relationships, and on amappable unit. These formations from bottom to top are, respectively: the Andıktaşı formation which comprisesmetalava, metatuff, and metapelite and that appears brown, green, and yellowish green-coloured in the field; theDedetepe formation which is mainly made up of quartz-muscovite schist, garnet-muscovite schist, garnet-albitechlorite schist and albite-chlorite-epidote schist, black marble, calc-schist, amphibolite and eclogite. On the top,the Salihler formation is composed mainly of phyllite, calc schist and white marble intercalations. The Denizgören ophiolite, including serpentinised peridotite, tectonically overlies the Çamlıca metamorphic association. Petrographical investigations, using index minerals of albite - garnet - epidote - chlorite observed in threedifferent formations, indicate that the Çamlıca metamorphic association was subjected to the greenschist - faciesmetamorphism. An early eclogite - facies mineral assemblage of garnet + omphacite + glaucophane + amphibolehas been determined. These mineral associations were subjected to amphibolite-facies metamorphism and finallyto retrograded greenschist-facies metamorphism. The Çamlıca metamorphic association is, then, probably anequivalent of the Iznik metamorphics located in the Sakarya Zone in terms of lithostratigraphy, stratigraphy andmetamorphic characteristics.