it was superseded by the Yayoi culture. Americas In North America, the Paleo-Indian Clovis Culture is believed to have ended around 8800 BC having fathered numerous local variants. One of these was the Folsom complex which was centred in the Great Plains and is dated from c.9000 to c.8000 BC. The people were hunter-gatherers who hunted the now-extinct Bison antiquus. In Patagonia, the Fell's Tradition prevailed through the millennium at Cueva Fell. Another Paleo-Indian site in the region is the Las Cuevas Canyon near Los Toldos (Santa Cruz) where rock art has been found. In Central America, remains of three prehistoric human fossils have been discovered since 2006 in the cave system at Chan Hol in Quintana Roo, Mexico. All have been dated to around the 9th millennium. Early warfare Evidence of a precursor to warfare has been found at Nataruk in Kenya. Remains of at least 27 individuals have been found and dated to around 8500 BC. The condition of the skeletons indicates that a massacre took place as hands were bound and skulls were smashed by blunt force. Communities in Africa at the time would have been nomadic hunter-gatherers. Rise of agriculture The Natufian culture continued to prevail in the Levantine and upper Mesopotamian areas of the Fertile Crescent with their most significant site at Jericho (Tell es-Sultan) in the Jordan Valley. The Natufian people had been sedentary or semi-sedentary through the 10th millennium, even before the introduction of agriculture. By about 8500 BC, the Natufians were harvesting wild wheat with flint-edged sickles. It was around that time, or soon afterwards, that the wild wheat crossed with a natural goat grass to form emmer, the seeds of which could scatter in the wind to spread naturally. Later, emmer crossed with another goat grass to form the even larger hybrid that is bread wheat. The Natufians learned how to harvest the new wheat, grind it into flour and make bread. The early bread was unleavened, with the dough allowed to dry on hot stones. Writing in 1973, Jacob Bronowski argued that the combination of wheat and water at Jericho enabled man to begin civilisation. Jericho, having a natural spring, was an oasis on the edge of the Syrian Desert and, although similar developments occurred elsewhere, Bronowski called Jericho "a microcosm of history". The earliest known cultivation of lentils was at Mureybet in Syria, where wheat and barley were also