<Table> <Tr> <Td> Madrasian Culture </Td> <Td> </Td> </Tr> <Tr> <Td> Soanian Culture </Td> <Td> </Td> </Tr> </Table> <Tr> <Td> Madrasian Culture </Td> <Td> </Td> </Tr> <Tr> <Td> Soanian Culture </Td> <Td> </Td> </Tr> <Tr> <Td> Neolithic (10,800--3300 BC) (show) <Table> <Tr> <Td> Bhirrana Culture </Td> <Td> (7570--6200 BC) </Td> </Tr> <Tr> <Td> Mehrgarh Culture </Td> <Td> (7000--3300 BC) </Td> </Tr> <Tr> <Td> Edakkal Culture </Td> <Td> (5000--3000 BC) </Td> </Tr> </Table> </Td> </Tr>

One of the major features of indus river valley archaeological sites is