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DOI

10.19076/mta.36922

Abstract

Study was carried out within Horasan formation around Köprüköy located in the east of Erzurum This formation is available in the region of Erzurum-Pasinler-Horasan forming the northest where neo-tectonic sediments are surfaced in East Anatolia. The unit is composed of pebble stones, clays and marl iteration. Ostracod, gastropod and pelecypod species were observed on the levels of clay stone with soft clasts and marl taken from the area. Generally, ostracod species which are unique to Ponto- Caspian basin were described in these units within the scope of the study. These are such ostracod species as Amnicythere idonea Mandelstam, Markova, Rozyeva and Stepanajtys, Candona (Caspiocypris) erzurumensis Freels, Candona (Caspiocypris) araxica Freels, Candona (Caspiocypris) aff. alta (Zalanyi), Candona (Lineocypris) aff. granulosa Zalanyi, Bakunella cf. dorsoarcuata (Zalanyi), Bakunella cf. subtriangularis (Sveyer),Candona (Candona) lycica Freels, Candona (Candona) armenia Freels, Candona (Candona) aff. elongata (Svejer), Fossilyocypris sarızensis (Şafak, Nazik and Şenol). There are also such micro mollusc species as Gyraulus inornatus, Dreissena polymorpha available in the sequence. Among these -genera; Candona (Candona) fresh water, Candona (Caspiocypris), Candona (Lineocypris), Fossilyocypris fresh - brackish water (oligohaline), Bakunella characterizes rarely fresh water,mostly brackish water, Amnicythere characterizes brackish water, Gyraulus, Dreissena characterize fresh water conditions. Ostracod fauna, determined in this study, indicates a group clearly supporting these comments in terms of the relation of age and environment and the age of the formation is Late Miocene- Pliocene according to the fauna.

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