Denizli Travertine: A Global Heritage Stone Resource Nominee from Western Türkiye

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Abstract A global heritage stone designated by International Union of Geological Sciences (IUGS) is a natural stone that has been widely used in significant architecture and monuments, recognized as integral aspects of human culture.The aim of this study is to evaluate the characteristics of the Quaternary travertine formations located in Western Türkiye called ‘Denizli Travertine’ as a global heritage stone candidate. The Denizli Travertine have been commonly used as building stones in the ancient cities of the Lycus Valley since the second century BC. The cotton-white Pamukkale Travertine, which was designated as one of The First 100 Geological Heritage by IUGS in 2022, is the recent part of the Denizli Travertine. The travertine-dominated structures have given a privileged feature to the aforementioned ancient cities. In these cities, public buildings such as theatre, agora, bath basilica, monumental fountain, bridges and fortification wall were predominantly built in travertine. Since the thirteenth century, the use of the travertine also continued in the buildings of Seljuk Period, like caravanserais, monumental tombs and castle walls. The travertine consists of carbonate minerals (i.e. mostly calcite, with less amount of aragonite) and is porous. The main texture is significantly wackestone to packstone including peloid, bacterial/crystalline dendrite, and coated grain. Another type is banded travertines, which occurs as a fissure fill or vein, have a completely crystalline texture and has been mostly used for decorative purpose. Contemporarily, the stone is widely used in many areas such as flooring, cladding, stair steps, countertops, table, coffee tables and sculptures and is traded worldwide, and therefore considered to deserve to be designated as a global heritage stone resource.