You live in San Jose? Dude! I used to live in Cupertino! Rawk on!!!
Anyway, to kinda wrap up this thread with my own opinion on the matter, the BO stands over the same spot it rose from in 12,000 BC and the same spot Lavos erupted from in 1999 AD, in 2300AD. This spot is the same spot Melchiors house is in 1000 AD, and Magus' castle is in 600 AD. This is the same spot as where Lavos crashed into the planet at Tyrano Lair in 65,000,000 BC.
Now according to the PD theory, which I find most believable (though I must give my input that it's not exactly perpendicular in time since it's not as strong in 12,000 BC when you fight it as in 1999 AD; interesting idea, whether it has merit or not. You decide), Lavos isn't actually inside the planet, its resting in the PD drawing and gathering DNA and energy and whatnot from the planet to itself in the PD. When it shows up on the planet, first does so when awakened rather rudely in 12,000 BC. Then does so when summoned rather forcefully in 600 AD, and finally willingly shows itself in 1999 AD.
The significance of where it landed merely shows where the portal/gate to its PD is. Everything fits together like a puzzle! Isn't that neat?