Yeni bir geç Kapitaniyen (Orta Permiyen) foraminifer cinsi (Neodiscidae) Elmadağ Olistostromu, Orta Anadolu (Ankara, Türkiye)

Öz

Üst Kretase Elmadağ Olistostromu, çeşitli boyutlarda, tiplerde (platform tipi karbonat, pelajik tip karbonat ve çört) ve farklı periyot/serilere ait (Karbonifer, Permiyen ve Jura-Kretase) çok sayıda blok içeren, İntra-Pontid Okyanusu'nun önülke fliş çökelleriyle karakterizedir. Bu çalışmada, Elmadağ Olistostromu'ndan derlenen bol fosilli bir karbonat bloğu, foraminifer toplulukları açısından incelenmiştir. Çeşitli geç Kapitaniyen foraminifer topluluğunun yanı sıra, Praeglobidiscus adlı yeni bir cins tanımlanmış ve Globidiscus cinsinin olası atası olarak önerilmiştir. Bu iki cins morfolojik olarak benzerdir, ancak Praeglobidiscus'un son sarılımlarındaki keskin üçgen çıkıntılar tek taraflı iken, bu Globidiscus'ta çift taraflıdır.

Anahtar Kelimeler

• Permiyen
• Kapitaniyen
• Miliolid
• Neodiscidae
• Elmadağ Olistostromu

A new late Capitanian (Middle Permian) foraminiferal genus (Neodiscidae) from the Elmadağ Olistostrome, Central Anatolia (Ankara, Türkiye)

Abstract

The upper Cretaceous Elmadağ Olistostrome is characterized by foreland flysch deposits of the Intra–Pontide Ocean, which include numerous blocks of various sizes, types (platform-type carbonate, pelagic-type carbonate and chert) and belong to different periods/series (Carboniferous, Permian and Jurassic–Cretaceous). In this study, a fossiliferous carbonate block, collected from the Elmadağ Olistostrome, was studied for its foraminiferal assemblages. Besides a diverse late Capitanian foraminiferal assemblage, a new genus, Praeglobidiscus, is defined and proposed as a possible ancestor of the genus Globidiscus. These two genera are morphologically similar, but the sharp triangular protrusions in the last whorls of Praeglobidiscus is one-sided, whereas it is two-sided in Globidiscus.

Keywords

• Permian
• Capitanian
• Miliolid
• Neodiscidae
• Elmadağ Olistostrome

Kaynakça

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