Probably 4th millennium:
Many such metal tools were found like these HERE.
Very interesting pottery:
This Yin Yang symbol is found on several pieces like these which is particularly interesting as there are many pottery motifs found in the Cucuteni–Trypillian that bear a striking resemblance to the Yangshao culture of China c.5000-3000BC. Compare with Cucuteni–Trypillian pottery.
At any rate, the above Yin Yang objects are said to be "granary shrines", which, sans iconography, remind me of ossuaries found in the Levant in the 5th/4th millennium:
Edited 1 time(s). Last edit at 15-May-18 22:46 by Thanos5150.