The family reaches the top of a mountain, and the individuals look around...in awe of what they see.
Once more, this idea explores the primary conceit of the series: that Neanderthal Man attempted to reach the highest frontiers of his world sought to discover what lay beyond it. Sometimes these individuals saw amazing things; other times they met horrors that made them want to hide in their cave.
A frontier, in this case, might mean knowledge. These individuals were climbing, simply, towards increased knowledge, to a better and deeper understanding of the world.
As we see in the series, the family sticks together -- through thick and thin -- no matter the circumstances. As we meet the actors in the next few shots, we also meet the characters they play. We become acquainted with the family.
We go, pretty much, from biggest to smallest, from adult to child.
We see a rock-fall, or Earthquake, and a member of the family is drawn away on a rough river current.
But the montage ends, appropriately, on family; on the hearth. At the end of the day -- after all the threats to survival -- the family ends up together around the fire, strengthening bonds.
Here's the introductory montage to Korg 70,000 B.C. in live-action: