103 GEOLOGICA BALCANICA, 36. 3—4, Sofia, Decemb. 2007, p. 103—110. The Silurian of the Çatak and Karadere areas of the Zonguldak Terrane, NW Anatolia Valeri Sachanski 1 , M. Cemal Göncüoğlu 2 , Ibrahim Gedik 3 , Cengiz Okuyucu 3 1 Bulgarian Academy of Sciences, Geological Institute, Acad. G. Bonchev St. Bl. 24, 1113 Sofia, Bulgaria E-mail: v_sachanski@geology.bas.bg 2 Middle East Technical University, Department of Geological Engineering, 06531 Ankara, Turkey 3 General Directorate of Mineral Research and Exploration, Department of Geological Research, 06520 Ankara, Turkey (Submitted: 10.09.2007; accepted for publication: 16.11.2007) Â. Ñà÷àíñêè, Ì. ×åìàë Ãüîí÷îîëó, È. Ãåäèê, ×. Okóþ÷ó — Ñèëóð ðàéîíîâ ×àòàê è Êàðàäå- ðå (òåððåéí Çîíãóëäàê) — Ñåâåðî-Çàïàäíàÿ Àíàòîëèÿ. Ïðîâåäåíî èññëåäîâàíèå ñèëóðà â íîâîóñòàíîâëåííûõ ðàçðåçàõ ×àòàê è Îâà÷ûê (òåððåéí Çîíãóëäàê), îáíàæåííõ ê þãî-çàïàäó îò ðàéîíîâ Ýôëàíè è Øàôðàíáîëó-Êàðàäåðå. Ðàçðåçû ïðèíàäëåæàò ê ñâèòå Ôûíäûêëû, êîòîðàÿ ïðåäñòàâëåíà ïðåèìóùåñòâåííî ÷åðíûìè ñèëèöèåâûìè àðãèëëèòàìè è ëèäèòàìè (â íèæíèõ îòäåëàõ), ÷åðíûìè àðãèëëèòàìè è ïåñ÷àíèñòûìè èçâåñòíÿêàìè (â ñðåäíèõ îòäå- ëàõ) è ãëèíàìè ñ ïå÷àíèñòûìè èçâåñòíÿêàìè è èçâåñòêîâûìè àëåâðîëèòàìè (â âåðõíèõ îò- äåëàõ). Ñíèçó ââåðõ ïî ðàçðåçó ×àòàê óñòàíîâëåíî ÷åòûðå èíòåðâàëà ñ ãðàïòîëèòàìè. Îíè ïðèíàäëåæàò ê ñëåäóþùêèì áèîçîíàì: âåðõíÿÿ Ì. riccartonensis — M. belophorus; âåðõíÿÿ Cyrt. rigidus — Cyrt. perneri è Cyrt. lundgreni.  ðàçðåçå Îâà÷ûê ãðàïòîëèòû ïðèíàäëåæàò ê áèîçîíàì: L. convolutus, ê âåðõíåé Str. crispus — Sp. turriculatus, O. spiralis è ê âåðõíåé Ì. riccartonensis — M. belophorus. Íàëè÷íûå äàííûå ïîêàçûâàþò, ÷òî, âî ïåðâûõ, èññëåäîâàííûå ïîñëåäîâàòåëüíîñòè ïî- ðîä íàõîäÿòñÿ â èíòåðâàëå ñðåäíèé Àýðîíèàí — ðàííèé Ãîìåðèàí. Èç íîâûõ íàõîäîê ïðî- èñòåêàåò è âòîðîé âàæíûé âûâîä, à èìåííî, ÷òî ñèëóð ðàéîíà ×àòàê ÿâëÿåòñÿ òèïè÷íûì äëÿ òåððåéíà Çîíãóëäàê. Áîëåå òîãî, ÿñåí è òðåòèé âûâîä î òîì, ÷òî ïîðîäû âåðõíåñèëó- ðèéñêîé ïîñëåäîâàòåëüíîñòè áûëè ïîëíîñòüþ óíè÷òîæåíû ýðîçèåé âî âðåìÿ ñðåäíåäåâîí- ñêèõ ñîáûòèé. Abstract. Silurian rocks in the newly discovered Catak and Ovacık sections of the Zonguldak Terrane to the SE of Eflâni and Safranbolu-Karadere areas, respectively, were studied by means of graptolites. They are included in Fındıklı Formation, dominated by black siliceous argillites and lydites in the lower part, black argillites and sandy limestones in the middle part and shales with sandy limestone and limey siltstone in the upper part. From bottom to the top four intervals with graptolites belonging to Upper M. riccartonensis — M. belophorus, Upper Cyrt. rigidus — Cyrt. perneri and Cyrt. lundgreni Biozones, respectively, were recognized in the Catak section. In the Ovacık section, the identified graptolites belong to the L. convolutus, Upper Str. crispus-Sp. turriculatus, O. spiralis and Upper M. riccartonensis — M. belophorus Biozones. The available data indicate that the studies succession includes an interval from mid Aeronian to early Homerian. Another important implication of the new findings is that the Silurian in the Catak area is typical for the Zonguldak Terrane. Moreover, it is obvious that the Upper Silurian succession was completely eroded in this terrane during the Mid Devonian event. Sachanski, V., Göncüoğlu, M. C., Gedik, I., Okuyucu, C. 2007. The Silurian of the Çatak and Karadere areas of the Zonguldak Terrane, NW Anatolia. — Geologica Balc., 36, 3—4; 103—110. Key words: Silurian, graptolite, stratigraphy, NW Turkey.