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28 different periods are considered in CDLI for dating the documents. These are:
| Period | Chronological Range |
|---|---|
| Pre-Writing | ca. 8500-3500 BC |
| Uruk V | ca. 3500-3350 BC |
| Uruk IV | ca. 3350-3200 BC |
| Uruk III | ca. 3200-3000 BC |
| Proto-Elamite | ca. 3100-2900 BC |
| ED I-II | ca. 2900-2700 BC |
| ED IIIa | ca. 2700-2500 BC |
| ED IIIb | ca. 2500-2340 BC |
| Ebla | ca. 2350-2250 BC |
