Lava is a yellow/orange substance that can be found in the later Dino Run levels. It is mostly harmless, although it will slow the player down when jumped on. It stuns the player like red dactyls. On certain occasions, the lava will trap you, and you will be a sitting duck for the not-far-behind Wall of Doom.
Lava stops pesky dinos from getting in the player's way, but it will slow the player down, which can mean death in certain situations.