When did flint become the stonen of choice?

Flint became the stone of choice for tool-making during the Paleolithic era, around 2.5 million years ago, due to its ability to be easily shaped and sharpened. This natural material was favored by early humans for crafting weapons and tools, as it could produce sharp edges when struck. Its prevalence continued through the Neolithic period, where it was integral to various cultures for both practical and ceremonial uses.