there are two i think 1 is the ancient ruins :get Tarbo and T-rex rank 12 fight Rosie with them and go see Dr.Diggins. 2 is the underground mole cave: after chapter 8 you go to Rivet Ravine and go into Cave tunnel four then when you find a spot that goes four directions with a VMM go up then left use th ladder to go into the cave where you can find Brachio, Tricera, Nodo, Zino, Megath, and Chelon. Hope This Helps!
The secret lab is located in the basement of Richmond building.
Moles secret tunnel -Noah Fredrick
It's in the moles secret tunnel,you'll find it in rivet ravine in the mines.
You have to rescue Rosie from BB Base.Then take your level up test.
you either look for them at the store or go to secret island and dig them up
in the pay-to-dig site
in dig site 1 forest
you go to Beth and ask to go to any of the dig sites
Find him at the pay-to-dig site in the Greenhorn plains
Press the A button in a dig site.
he is in the pay to dig site you must go to the white canyon. the pay to dig site opens in the after game.
a secret tunnel is between two unbreakable bones dig!
You are supposted to battle Holt in a Fossil Battle. Holt is the guy who appears in the trial dig site.