Cannibal Gold

Four men.
Four Days.
For the fight of their lives.
It was just a walk in the desert to a place 100,000 years in the past.
They thought they knew what to expect but they were wrong.
Now a team of scientists is trapped in a world they were not prepared for and can never return from.
Their only hope lies in a quartet of former US Army Rangers willing to travel to prehistoric Nevada and face unknown horrors and impossible odds to bring them home from Bad Times.