The culture takes its name from the town of Longshan -- literally "Dragon Mountain" -- in Zhangqiu, Shandong province, where archaeologists first identified its distinctive pottery at the Chengziya site in 1928. Excavations in 1930 and 1931 revealed a sophisticated material culture that was clearly distinct from the earlier painted-pottery Yangshao culture. For decades, the highly polished black pottery served as the primary diagnostic marker, and any Neolithic site producing it was assigned to the Longshan. Modern archaeology has revealed far more regional diversity than early researchers suspected. What was once treated as a single culture is now understood as a family of related but distinct regional traditions, with the term "Longshan" reserved for the middle and lower Yellow River valley. The contemporaneous culture of the lower Yangtze, for example, is now classified separately as the Liangzhu culture.

During the third millennium BC, the Longshan population expanded dramatically. Settlements grew into cities with rammed-earth walls, clearly demarcated neighborhoods for different social classes, and large elite residences alongside ritual structures. At least thirty walled towns have been identified -- twenty in Shandong alone. The largest sites, Liangchengzhen and Yaowangcheng on the southeast Shandong coast, covered 273 and 368 hectares respectively. Each was surrounded by a hierarchy of economically integrated settlements, but the space between them contained remarkably few sites, suggesting they were capitals of rival polities in competition with one another. The introduction of the dagger-axe -- a weapon designed solely for combat, useless for hunting -- tells its own story about what that competition entailed.

The Longshan people grew foxtail millet as their primary crop, supplemented by broomcorn millet, rice, and wheat. They raised pigs for meat, domesticated sheep and goats, and began the small-scale silk production -- raising and domesticating silkworms -- that would eventually become one of China's defining industries. Their divination practices, heating animal scapulae to read the cracks, prefigured the oracle bone traditions of the later Shang dynasty. And they were physically imposing. Skeletal remains from Shandong sites include males between 180 and 190 centimeters tall, making the Longshan the tallest Neolithic population yet discovered anywhere in the world. The tallest individual on record, a male from Shaanxi, stood 193 centimeters -- and was only sixteen to eighteen years old when he died.

Around 2000 BC, something went wrong. Populations declined sharply across most of the Longshan world, and many of the largest centers were abandoned. The high-quality black pottery vanished from ritual burials. Environmental change linked to the end of the Holocene Climatic Optimum is the leading suspect. But in one small area -- the basin of the Yi and Luo rivers in central Henan -- population and social complexity actually accelerated. This region evolved continuously, through a transitional Xinzhai phase, into the Erlitou culture, which most archaeologists consider the first Bronze Age state in China and a likely candidate for the semi-legendary Xia dynasty. The Longshan collapse was not the end of Chinese civilization. It was the crucible from which the first dynasties emerged.