Such graves have also been found in Mycenaean Greece and parts of Eastern Europe. Deceased Catacomb individuals were typically buried in a flexed position on their right side. They were often accompanied by ornaments such as silver rings, and weapons such as stone and metal axes, arrows, daggers and maces. Animal sacrifices, including head and hooves of goats, sheep, horses and cattle, occur in about 16% of Catacomb graves. Cattle sacrifices in the Catacomb culture are more frequent than in the Yamnaya culture. Similar horse burials also appeared in the earlier Khvalynsk culture, and in the Poltavka culture. Catacomb burials are occasionally covered with Kurgan stelae. This practice was also common in the Yamnaya culture. Some three hundred stelae have been found from the Yamnaya culture and the Catacomb culture. Catacomb burials are sometimes accompanied by wheeled vehicles. Such wagon burials are attested in the earlier Yamnaya culture, and later among Iranian peoples (Scythians), Celts, and Italic peoples. Aspects of the burial rite of the Catacomb culture have been detected in the Bishkent culture of southern Tajikistan. In some cases, the skull of deceased Catacomb people was modelled in clay. This involved the filling of the mouth, ears and nasal cavity with clay and modeling the surface features of the face. This practice is associated with high-status burials containing prestige items. The practice was performed on men, women, and children. It has been suggested that these clay masks may have served as a prototype for the later gold masks found in Mycenaean Greece. Economy The economy of the Catacomb culture has been based mostly on stockbreeding. Remains of cattle, sheep, goat, horse and some pigs have been found. Plant remains are exceedingly rare, but traces of wheat, such as einkorn and emmer, have been found. Wooden ploughs have been found at Catacomb burials, indicating that agriculture was practiced. The types of tools used by the Catacomb people suggest that the culture included several craft specialists, including weavers, bronze workers and weapons manufacturers. Similar metal types to those of the Catacomb culture later appears among the Abashevo culture. Settlements Little evidence of Catacomb settlements has been found. These are mostly seasonal camp-sites located near sources of water. A larger settlement has been found at Matveyevka on the southern Bug. It has three large structures with foundations of stone. On the island of Bayda in the Dnieper river, a stone-built fortress of