Shock-wave experiments on iron preheated to 1573 K from 14 to 73 GPa, yield sound velocities of the γ- and liquid-phases. Melting is observed in the highest pressure (~71 ¿ 2 GPa) experiments at calculated shock temperatures of 2775 ¿ 160 K. This single crossing of the γ-liquid boundary agrees with the γ-iron melting line of Boehler <1993>, Saxena et al. <1993>, and Jephcoat and Besedin <1997>. This γ-iron melting curve is ~300¿C lower than that of Shen et al. <1998> at 80 GPa. In agreement with Brown <2001> the discrepancy between the diamond cell melting data and the iron shock temperatures require the occurrence of yet another sub-solidus phase along the principal Hugoniot at ~200 GPa. This would reconcile the static and dynamic data for iron's melting curve. Upward pressure and temperature extrapolation of the γ-iron melting curve to 330 GPa yields 5300 ¿ 400 K for the inner core-outer core boundary temperature.