The Chronoliths

It's a very curious story, and as you might have guessed from the name (depending on your Latin knowledge) it's about time and stones...

From the synopsis:

One day in Thailand, 21st-century slacker Scott Warden witnesses an impossible event: the violent appearance of a 200-foot stone pillar. Its arrival collapses trees for a quarter mile around its base. It appears to be composed of an exotic form of matter. And the inscription chiseled into it commemorates a military victory...sixteen years hence...