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Silverbolt, the lightbulb contest is over.
Who created the monolith we see in Shadows of the Past?
How did the archmage find it?
Did the gargoyles of the Wyvern clan during the Dark Age era ever stumble upon it?
I'm not sure what you mean by monolith? Do you mean the megalith circle? Or the wall that contained prophetic carvings, including images of the Archmage?
The Archmage explored the caves for his own purposes.
Again, since I'm not clear on what "it" you're referring too, it's hard to answer the questions. The gargs had been in those caves, witness "Long Way to Morning".