Chronological Distribution
possible pre Old Akkadian period (before 2300 BC)	___ ___
Period of Puzur-Sushinak (circa 2150-2100 BC)	___ ___
Possible 21st century BC	___
End of the 3rd millennium BC	___ ___
End of the 3rd and beginning of the 2nd millennium BC	___ ___
Beginning of the 2nd millennium BC	___
Unknown	___