Around the beginning of the 8th millennium BCE Göbekli Tepe lost its importance. The advent of agriculture and animal husbandry brought new realities to human life in the area, and the "Stone-age zoo" (Schmidt's phrase applied particularly to Layer III, Enclosure D) apparently lost whatever significance it had had for the region's older, foraging communities. However, the complex was not simply abandoned and forgotten to be gradually destroyed by the elements. Instead, each enclosure was deliberately buried under as much as of refuse, creating a tell consisting mainly of small limestone fragments, stone vessels, and stone tools. Many animal and even human bones have been identified in the fill.