When can the history of China's calligraphy date back to the earliest?

Wen Tao, the symbol of primitive times, is the embryonic form of China characters, an abstract plastic art of calligraphy, and the source and beginning of China calligraphy art. Since Shang Dynasty, there have been clear characters, namely "Oracle Bone Inscriptions". Compared with the previous seal cutting symbols, it has a more complete system and skills of writing and seal cutting, so it is the earliest calligraphy.