Abstract: The Daday-Devrekani massif, located around Kastamonu region of the western Pont ides, consists of various metamorphic rocksranging from Precambrian to Early Cretaceous in age. These metamorphic rocks were derived from different source rocks in different geodynamic environments by different metamorphic conditions. The Precambrian Daday-Devrekani metasedimentary group,consisting of high-grade metased intents, is made typically of continental crust. It has also been affected by an Early-Middle Jurassicretrograde metamorphism. The Samatlar group of Lower-Middle Paleozoic age (the epicont mental cover) has been metamorphosedto very low-grade by Upper Jurassic, uossibly in Lower-Middle Jurassic. The Börümce formation of Lower Jurassic aget comprisingboth epiophiolitic and epiconlinental characters with some Lower-Middle Jurassic K-Ar ages, was affected by the very low-grademetamorphism similar to that of the Samatlar group.The p re-Lower Jurassic Çangal metaophiolite is a well-preserved fragment of oceanic crust. The Çangal metaophiolite was initially subjected to an ocean floor metamorphism before Lower Jurassic in the physical conditions of greenschist and epidoieamphibolite fades, it has also been affected by a later metamorphism during Lower-Middle Jurassic period. There are some contactaureole rocks, called Göynükdağı metamorphite with a total thickness up to 400 m in Göynükdağı region, developed around the Ahiçay-Elmalıçay granitoid from the Middle Jurassic Kastamonu granitoid belt which is an arc plutonism product. The Göynükdağıcontact aureole is composed mainly of spotted rocks of hornblend-hornfels and albite-epidote hornfels fades in the inner and outerzones, respectively. rThe cataclastic rocks such as protomylonite, mylonite, mylonite-schist and mylonite-gneiss, derived from the continental assemblage, and the glaocophane-schists, derived from the oceanic assemblage, altogether yield some Lower Cretaceous K-Ar ages. The Precambrian D aday-Devrekani metasedimentary group and its epicontinenîal cover Samaîlar group, oldest units in the Daday -Devrekani massif, are considered to be the southernmost tip of Eurasian plate. The Çangal metaophiolite is thought to be a wellpreserved part of the paleo-Tethyan oceanic cruts. As for the Börümce formation, it is assumed as epicontinental and sometimes epiophiolitic cover. The Göynükdağı contact aureole determines the contact haleous developed around arc plutonism. The Lower -Middle Jurassic metamorphism, affecting almost all the units in the D aday-Devrekani massif, and the arc magmatism of the MiddleJurassic Kastamonu granitoid belt are interpreted as the products of the subduct ion zone created by the northward subduct ion of thepaleo-Tethyan oceanic crust beneath the Eurasian plate. The Lower Cretaceous caiaclastites and glaucophanitic rocks are thoughtto have been generated by the collage between the Eurasia (Pontides) and Anatolia.