A4: TURKEY OZNUR TEPE SITE

This page authored by Steve Kershaw


Oznur Tepe is not yet fully described, so here is presented only a few images to show the key features of the site, and to highlight its difference from other PTB microbialites.

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Full description in preparation by several authors including Steve Kershaw, Aymon Baud, Sylvle Crasquin, Marie-Beatrice Forel.

Oznur Tepe crops out by a small river. the three photographs here show the beds dip steeply, exposing an easily accessible PTB sequence. PTB arrowed in bottom right photo of these three.

The latest Permian erosion surface seen at Çürük Dag (and also in South China) is also seen here, with a smoothly-eroded surface highlighted by light grey limestone in these photos. Grainstone is deposited on the erosion surface as at Çürük Dag. A gastropod is seen below the erosion surface.

Stromatolites formed in the upper part of the grainstone

Photo: Steve Kershaw

Photo: Steve Kershaw

Photo: Steve Kershaw

Photo: Steve Kershaw

Photo: Steve Kershaw

Photo: Steve Kershaw

Photo: Steve Kershaw

Photo: Steve Kershaw

Photo: Steve Kershaw

Photo: Steve Kershaw

Stromatolites then dominate the lower section of microbialite

In the middle of the microbialite sequence is a thin thrombolite

Photo: Steve Kershaw

Photo: Steve Kershaw

Most of the upper part of the microbialite is dominated by hybrid microbialites, with oblique microbial clots, not yet observed in any other PTB microbialite site worldwide. Thus so far these structures in Oznur Tepe are unique.

Photo below shows the hybrid nature of this sample, with small crystal fans encrusted by clotted oblique fabric.

NOTE: the orientations of these samples is directly up-page, so that the oblique angle of the microbialite is a growth feature.