A4: TURKEY CURUK DAG SITE: Photos at 1.8 m

This page authored by Steve Kershaw


Photos on this page show thrombolites near the base of the microbialite.

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Photo: Steve Kershaw

Photo: Steve Kershaw

Photo: Steve Kershaw

Photo: Steve Kershaw

Photo: Steve Kershaw

Photo: Steve Kershaw

Photo: Steve Kershaw

Below is a picture of two loose samples showing the difference between thrombolite and hybrid microbiaite.

Below are two pictures polished blocks of thrombolite.

Upper photo is VS and shows the top surface is eroded, with packstone overlying. This emphasises the small-scale environmental changes that took place as this microbialite sequence grew.

Lower photo shows TS of the same sample, illustrating the clotted nature of these thrombolites.

In thin section, these thrombolites are composed of clotted micrite forming a framework (see photo composite at the bottom of this page).

Below is a VS composite photograph of a thin section of thrombolite, showing the clotted micrite frameworkthese thrombolites are composed of clotted micrite forming a framework that is partly infilled with geopetal sediment and the remaining space filled with later cement. This demonstrates the constructed nature of this thrombolite, so it is not simply composed of microbially-mediated micrite forming clots on the sea-floor; it had a frame, therefore suggesting it could be fitted into a reefal classification.

Below are two pictures polished blocks of thrombolite.

Upper photo is VS and shows the top surface has rounded terminations of thrombolite clots indicating a lumpy surface,

Lower photo shows TS of the same sample, again emphasising the clotted nature of these thrombolites.

In thin section, these thrombolites are composed of clotted micrite forming a framework (see photo composite at the bottom of this page).

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