Where do you go after killing the t rex in Lara croft anniversary?

First, where the t-rex has died ( Covered With Rocks ) There is rocks placed around the dead t-rex. Go to the dead t-rex, and climb on the rocks, then once on a rock, jump forward near the t-rex's head. Go forward and you should see a platform with a cog on it, while there is water surrounding the platform. Grab the cog, and go underwater and follow the tunnel. Go around the tunnel, and get out the water. Once out the water, there should be a Pole in front of you, climb on the pole, and jump on the platform right in front of the pole. Then, follow where the ledges are, and you should go ALL around the entire jungle where you first entered the whole Dinosaur Part of the level. Hope this is helpful.