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Based on the field surveys conducted at the site, it is observed that there are numerous weathering forms of various sizes and intensities on the historical structures of Mardin. The degradation features of stones are described based on the classification scheme proposed by ICOMOS (ICOMOS-ISCS 2008).

The most common weathering forms developed on the structures are defined as “cracks”, “detachments”, “material loss”, “discolorations and deposits”, and “biological colonization” (Figure 2). Most of the observed “cracks” are in the form of vertical and horizontal cracks, crack networks and fractures. “Detachments”, on the other hand, are mostly in the form of blistering, crumbling, chipping, flaking and contour scaling. “Material losses” are mostly in the form of alveolization, erosion, mechanical damage and missing part. Efflorescence, crusts, deposits, discoloration, and graffiti are widely observed “discolorations and deposits” forms of weathering. Finally, the weathering forms observed for biological colonizations are pigeon droppings, lichen, plant and algae.