What was the earliest form of divination?

Divination, which precedes divination, is to drill holes in tortoise shells or animal bones and then bake them with fire to infer good or bad luck according to the shape of cracks, also known as tortoise divination. Zhan uses the process of yarrow variables to get divination, which is called divination or divination. Oracle Bone Inscriptions unearthed in Yin Ruins recorded many inscriptions, dates of divination, names of diviners, symbols and certificates. In the Zhou Dynasty, the ancient divination book Zhouyi appeared, forming a divination theory centered on gossip.