I can't remember the name of a sci-fi movie that I've seen years ago. I've seen it at least 5 years ago or more. In the movie a corporation was involved in exploring another earth or involved in travelling to different times of the earth by using a portal (like "Ground Bridge" in Transformers Prime). They traveled on a bridge-like structure made of light (like "Hard Light Bridge" in Portal 2, but wider). Later, some of the team members accidentally made change in the traveled world and in result, their own world gets spoiled.
You can see the shiny bridge they use for time travel in the trailer around 0:43 (there's also a still below). If I recall correctly, they must never veer off from it - but they do, of course, and their actions in the prehistoric past start altering the present. The entire movie is currently available on Youtube.