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At Amnya, her team also noted a possible sign of social stratification, another development often linked to agriculture: a cluster of houses that sat, undefended, outside the palisade.

The bill defined caste as "an individual's perceived position in a system of social stratification on the basis of inherited status."

The bill defined caste as "an individual’s perceived position in a system of social stratification on the basis of inherited status."

The caste system is among the world's oldest forms of rigid social stratification.

Some of the settlements coming to light were marked by “a surprisingly light ecological footprint,” the designers said, without any signs “of centralized control or social stratification.”