Petrified growth flora seen alongside Vex ruins points to them being present during a lush period of Mars' history, possibly from another Mars entirely. The immediate surroundings and lifeforms near the ruins are possibly from the distant past or future if the ruins were not present during terraforming by the Traveler. If they were present during the Golden Age there is no record of it.
The twin "man cannons" launching Guardians from one end of the map to the other seem to be incomplete, or even specialized, Vex gates missing half of their structure unlike dedicated lifts such as the one in the Venus Citadel. Perhaps the acceleration these gates impart upon entering objects provides insight into the function of other complete gates.
ARENA DESIGNATION: Crossroads
Detailed analysis of the site estimates three separate ecosystems that the landscape could support, if the area had any wildlife to benefit from it. A Hidden report to Ikora mentioned, “They clove this ruin out of the land, possibly to defend themselves from a long-vanished enemy, or perhaps to isolate the land for experimentation.”