<Dd> <Dl> <Dd> <Dl> <Dd> Dates are approximate, consult particular article for details </Dd> <Dd> Prehistoric (or Proto - historic) Iron Age Historic Iron Age </Dd> </Dl> </Dd> </Dl> </Dd> <Dl> <Dd> <Dl> <Dd> Dates are approximate, consult particular article for details </Dd> <Dd> Prehistoric (or Proto - historic) Iron Age Historic Iron Age </Dd> </Dl> </Dd> </Dl> <Dd> <Dl> <Dd> Dates are approximate, consult particular article for details </Dd> <Dd> Prehistoric (or Proto - historic) Iron Age Historic Iron Age </Dd> </Dl> </Dd> <Dl> <Dd> Dates are approximate, consult particular article for details </Dd> <Dd> Prehistoric (or Proto - historic) Iron Age Historic Iron Age </Dd> </Dl>

Why was the roman phase of iron age marked by stagnation of science