Either the trees grew underneath the skeleton and held it aloft, or those trees can actually grow underwater, but I doubt the river actually came up to the forest: as you can see in the opening sequence, the Grubb settlement is not far from the water's edge, and Grubbs keep their buildings a good distance away to avoid disturbing the water's flow. Hence that section of the river can't have drained that much.
Tenuous, I know. Also, did I mention that the ribcage isn't that of a Sea Rex?
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