Recently,while watching a dino show,I thought how funny it is that they always situate trees and vegitation around the dino. And they always draw the vegitation to scale. I thought that since dinos were definately heavy just simply walking along they would kill vegitation by trompping over it and uproot trees in their path. Imagine a dino trying to walk through a forest. they would just plow down trees with the width of their bodies. Then this other idea came to me. Possibly gravity was a bit different then. Maybe not terribly so but enough different to prevent distruction from the weight of the masssive number of dinos trompping over vegitation. Maybe trees could bend a lot without the pulling of gravity causing them to snap. Possibly as meteors hit the ground and other planets situated themselves around us the magnetic pull of the new planets changed the gravity making it more difficult for the dinos to move about, causing distruction on vegitation causing massive new vibration on the earth on the califorinan plain that may have lead to many earthquakes, then volcanos, then the total distruction etc..