The 2004 season studies of ground stones can be grouped in two categories: processing finds on site which are discovered during the excavations: continuation of the geographical surveys in order to define the raw material sources from which ground stone artefacts produced. Both these aspects of the study aim to understand the ground stone assemblage of the site and identification of the raw material sources of the tools that have been produced. The conducted studies on the ground stone assemblages and sources were useful not only for Çatalhöyük Research Project but also for the understanding of the Central Anatolian ground stone assemblages and their raw material sources.

Figure 44. This piece covered with ochre may be a natural formation or a fossil but the raw material is Meerschaum. The only source of this raw material in Turkey is nearby Eskişehir, which is almost 6 hours drive to the NW of the site. Meerschaum is a raw material type that was never listed or mentioned by Mellaart.