The northern border of Shang culture moved south during the Yinxu period. At the same time bronzes belonging to the Northern complex spread through a vast region to the north of the Shang cultural area.

The appearance of Northern bronzes, characterized by specific types of short swords, fu battle-axes and daggers -- which we may take to represent the Northern bronzes of Period 1 -- must predate the Yinxu culture. During the early Yinxu period they exerted a fairly consider able influence. Analysis of the bronzes unearthed from the Fu Hao tomb reveals that, at the time of Wu Ding, the Shang were already using some Northern bronze articles. The Shang artisans not only copied Northern bronzes, they also adopted their chemical composition to improve traditional Shang tools and weapons.

On the other hand, bronzes from the Shang culture area exerted a similar influence on Northern bronzes. Some of these influences were limited to relatively close areas, whereas the ripples of other influence extended far into the distant regions. For example, the Northern “beak halberd” the creation of which was influenced by the Shang ge-halberd, was diffused as far as the Minusinsk Basin. The origin of the bronze bow-shaped article, however, which has, in the past, been taken as strong evidence for the extension of Shang influence as far as this basin may very well be in the region to the north of the Shang culture, and the Yinxu style bow-shaped bronze may, on the contrary, have been a variant of the Northern article which developed during the early Yinxu period. The influence of the authentic Yinxu style bow-shaped article only extended as far as the area of Jibei . The lobeless, geometric-patterned, hollow-socketed fu-axe, which developed from the hollow-socketed fu of the Erligang to Yinxu periods, may have early on exerted an influence as far as the southern edges of the Eastern Siberian forest.

A reexamination of the ties between the Karasuk and Yinxu cultures is needed. The theory that Seima bronzes exerted an influence on the Yinxu culture must be abandoned.