These assertions were quickly challenged by Sandweiss and Moseley, who observed that Caral, though the largest and most complex Preceramic site, is not the oldest. They admitted the importance of agriculture to industry and to augment diet, while broadly affirming "the formative role of marine resources in early Andean civilization". Scholars now agree that the inland sites did have significantly greater populations, and that there were "so many more people along the four rivers than on the shore that they had to have been dominant".