The proto-cuneiform signs on the Kish tablet are purely pictographic, and have not been deciphered or demonstrated to correspond to human language. It has been dated to the Uruk period (c. 3500–3200 BC).[3] Several thousand proto-cuneiform documents dating to Uruk IV and III periods (c. 3350–3000 BC) have been found in Uruk. The marks represent a transitional stage between proto-writing and the emergence of the partly syllabic writing of proper cuneiform writing . The proto-literate period of Egypt and Mesopotamia is taken to span c. 3500 – c. 2900 BC. The administrative texts of the Jemdet Nasr period (3100–2900 BC), found among other places at Jemdet Nasr and Tell Uqair represent a further stage in the development from proto-cuneiform to cuneiform, but can still not be identified with Sumerian with certainty.[4]
^Hayes, John L., 1990 A Manual of Sumerian Grammar and Texts, Undena Publications, p. 266
^Woods, Christopher (2010), "The earliest Mesopotamian writing"(PDF), in Woods, Christopher (ed.), Visible language. Inventions of writing in the ancient Middle East and beyond, Oriental Institute Museum Publications, vol. 32, Chicago: University of Chicago, pp. 33–50, ISBN978-1-885923-76-9
Further reading
A. C. Moorhouse, The Triumph of the Alphabet: A History of Writing