In fossil fighters where do you find a guan fossil

I found mine in the room where you got Ingo's fossil (Mt. Lavaflow). If you want it to learn Great Unmasking so it can transform into a T-rex, it must have all 4 parts (Head, body, legs, arms). Honestly, a T-rex is better than a guan T-rex and you find the T-rex at Parchment Desert after you buy all of the Oasises. At 20,000 each, the oasises are VERY EXPENSIVE, but they are worth it. Oh, ya, the Parchment Desert is available after you beat the main storyline. Guans are good, but for a T-rex, nothing is better at being a T-rex than a real one.
Hope this helped!