What is the oldest style in China's calligraphy?

It is recognized by academic circles that the earliest materials of ancient Chinese characters are Oracle Bone Inscriptions and bronze inscriptions in the middle and late Shang Dynasty (about 14 to 1 1 century). From the perspective of calligraphy, these earliest Chinese characters already have many factors of formal beauty of calligraphy, such as beauty of lines, symmetry, variation, composition and style. From the late Shang Dynasty to the Qin Dynasty's unification of China (22 1 year ago), the general trend of the evolution of Chinese characters was from complexity to simplicity. This evolution is reflected in the evolution of fonts and glyphs. In the late Western Zhou Dynasty, the bronze inscriptions tended to be straight, and the folk cursive seal script developed to ancient plum in the Warring States period, which greatly weakened pictographs. However, the artistry of calligraphy has been enriched with the development of calligraphy.