Recorded history
More complete writing systems were preceded by proto-writing. Early examples are the Jiahu symbols (c. 6600 BCE), Vinča signs (c. 5300 BCE), early Indus script (c. 3500 BCE) and Nsibidi script (c. before 500 CE). There is disagreement concerning exactly when prehistory becomes history, and when proto-writing became "true writing" However, invention of the first writing systems is roughly contemporary with the beginning of the Bronze Age in the late Neolithic of the late 4th millennium BCE. The Sumerian archaic cuneiform script and the Egyptian hieroglyphs are generally considered the earliest writing systems, both emerging out of their ancestral proto-literate symbol systems from 3400–3200 BCE with earliest coherent texts from about 2600 BCE.
Ban Chiang
The first datings of the artifacts using the thermoluminescence technique resulted in a range from 4420 BCE to 3400 BCE, which would have made the site the earliest Bronze Age culture in the world. However, with the 1974–1975 excavation, sufficient material became available for radiocarbon dating, which resulted in more recent dates. The earliest grave was about 2100 BCE, the latest about 200 CE. Bronze making began circa 2000 BCE, as evidenced by crucibles and bronze fragments. Bronze objects include bracelets, rings, anklets, wires and rods, spearheads, axes and adzes, hooks, blades, and little bells.