ABSTRACT: In the Sinop bankı, a sedinıeaıtary sequence with a thickness öl more than ten thousandsmotors has been developed during the lias-Quaternary tiinie iiitervaJ,Metamorphlc rocks of Boyabat fonu the basement of the bairfit, I®m a^eû Akgël formation unctmfor^mably overlies the basement, Bürnük formation, composed of red iconfrlomerategj overlies Ategol formattonwith an unoonfiarmity, Dumig1 Borger and Malm» a shallow marine environment has been presented Inthe area and the Akkaya Umestone formation lia« been deposited with Its platform-type carbonates,consisting of thick layer» and occasionally ancwing reef characteristics with abundant organJsınSt LowerCretaceous aged Çağlayan formation overMes Akkaya Limestones with anı unconformity, and consists ofturbldltic sandy Hmeatonej üandstane MterbeMed black^^ialè and marts. Which implies the presence of amarine environment. Bareness of iomûn and the abunclamca of pyrites Indicate the presence of a reduction` inthe environmental canditftms. At the end of Lower Cretaceou^ the area has been teçtonïcalïy upliftedagalnı. From the beginning »of the Santonlan, aiubsidënce restarted, During Bantonian and Oampanianfred colored cherty, mlcrltlc limestones, indicatttag` the peeiitaftiJes of a dteep marine environment, have beendeposited, At the end of Oampanian, the area has clearly acquired the chraeteriistîes of a goesyneline.The Yeimfliomy formatJcn, v/hich has been developed over Kapanbofazı formattottj Is of the volcanic flysehfacie», eon&Ssting of turbïclltic sandston-nisarl Interbedded tuff and tuffite alternattons, Th% unit isovertain by the Cankurtaran formatton, which is of Maastricntian, and which coniÄist of the alternation oftıırMdiâtic sondstone» inarf and shale tiiat have been formed in the flyseh fades,Th© Akveren jßarmation has a caieiturbfditle charaeter, and it is overlain by ttie turbidlttc red coloredAtbap formatton. Of sédimentation that has Initiated in Santonian had continued until Lower Eocenewithout any intennission, The area preserves its geosyncllne character during this time Interval, The Yenikonak formation overlies these deposits with an unconformity. Them all these units are overlain by theSlnop and Sarikum formations with an angular unconformity. Additionally, the Hamsaros formation ofthe region oansists of basaltic agglomerates^ volcanic tuffs, dykes and basalt lavas,