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The AAPG/Datapages Combined Publications Database

CSPG Special Publications

Abstract


Intl. Symposium of the Devonian system: Papers, Volume II, 1967
Pages 61-66
Stratigraphy of Special Areas

The Devonian of Bithynia, northwest Turkey

Winfried Haas

Abstract

The Marmara Sea region southwest of Istanbul contains a succession of older Palaeozoic rocks representative for northwest Turkey. An apparently continuous sequence extends from Ordovician to Middle Carboniferous and is more than 3000 m. thick.

Clastic deposits of the Ordovician and Lower Silurian pass upwards into limestones of the higher Silurian Akviran Formation (nov.)

In general the Devonian sequence begins with the Soganli Beds (nov.). Mainly nodular limestones succeed Upper Ludlovian bedded limestones and pass upwards into marls with limestone nodules. The mainly Hercynian fauna indicates Lochkovian to Pragian. The arenaceous shales of the overlying Kartal Beds (nov.) contain a Rhenish fauna of late Early Emsian or early Late Emsian age. The Kurtdogmus Beds (nov.) consist of arenaceous limestones and calcareous graywackes with a predominantly Rhenish fauna of Late Emsian age. The calcareous marls with limestone nodules of the Dede Beds (nov.) contain a mainly Hercynian fauna. They represent the uppermost Emsian. The Dede Beds pass upwards in the Gebze Beds (nov.) consisting of marls with limestone nodules, containing a mainly Hercynian fauna of Eifelian age. The overlying Denizli Beds (nov.) are nodular limestones and thin bedded limestones with a poor fauna, extending from later Eifelian probably to the end of the Devonian. The Soganli, Kartal, Kurtdogmus and Dede Beds together form the Marmara Formation (nov.). The Tuzla Formation (nov.) consists of the Gebze and Denizli Beds.

The beds are overlain by the Thracian Series (nov. sens.) consisting of many-coloured siliceous shales and lydites and thick graywackes of Early to Middle Carboniferous age. The Triassic follows with sharp angular discordance.


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