It has long been an article of faith by scholars that the rise of civilization was based on intensive agriculture, particularly of at least one
cereal. The production of agricultural surpluses is seen as essential in promoting population density and the emergence of complex society. Anthropologist
Michael E. Moseley challenged this view in the 1970s, asserting that the earliest civilizations in Peru were based not on agriculture, but on exploitation of the rich maritime resources of the Peruvian coastline at sites such as Las Haldas which practiced little or no agriculture. Reinforcing Moseley's theory, Los Haldas, according to radiocarbon dating, appears to be older than many nearby inland agricultural sites in the Casma and Sechin Valleys. Investigations and earlier dating of other sites, notably nearby Sechin Bajo, have called Moseley's hypothesis into question, but in 2004 he still maintained that perhaps "Peruvian fisherman can be credited for creating the earliest civilizations in the Americas." ==Water==