grapes in the world has been found at Gadachrili Gora, near the village of Imiri, Marneuli Municipality, in southeastern Republic of Georgia; carbon-dating points to the date of about 6000 BC. Grape pips dating back to the V-IVth millennia BC were found in Shulaveri; others dating back to the IVth millennium BC were found in Khizanaant Gora—all in this same 'Shulaveri area' of the Republic of Georgia. A theory has been suggested by Stephen Batiuk that the Kura-Araxes folk may have spread Vitis vinifera vine and wine technology to the "Fertile Crescent"—to Mesopotamia and the Eastern Mediterranean. The spread of the wine-goblet form, such as represented by the Khirbet Kerak ware, is clearly associated with these peoples. The same applies to the large ceramic vessels used for grape fermentation. Burial customs Inhumation practices are mixed. Flat graves are found but so are substantial kurgan burials, the latter of which may be surrounded by dolmen. This points to a heterogeneous ethno-linguistic population (see section below). Analyzing the situation in the Kura-Araxes period, T. A. Akhundov notes the lack of unity in funerary monuments, which he considers more than strange in the framework of a single culture; for the funeral rites reflect the deep culture-forming foundations and are weakly influenced by external customs. There are non-kurgan and kurgan burials, burials in ground pits, in stone boxes and crypts, in the underlying ground strata and on top of them; using both the round and rectangular burials; there are also substantial differences in the typical corpse position. Burial complexes of Kura–Araxes culture sometimes also include cremation. Here one can come to the conclusion that the Kura–Araxes culture developed gradually through a synthesis of several cultural traditions, including the ancient cultures of the Caucasus and nearby territories. Late Kura-Araxes sites often featured Kurgans of greatly varying sizes, with larger, wealthier kurgans surrounded by smaller kurgans containing less wealth. These kurgans also contained a wide assortment metalworks. This trend suggests the eventual emergence of a marked social hierarchy. Their practice of storing relatively great wealth in burial kurgans was probably a cultural influence from the more ancient civilizations of the Fertile Crescent to the south. In the 3rd millennium B.C., one particular group of mounds of the Kura–Araxes culture is remarkable for their wealth. This was the final stage of culture's development. These burial mounds are known as the Martqopi (or Martkopi) period mounds. Those on