Tiamat Sea 310 million years hence
For the first part of the Neozoic, a large sea partially enclosed by Pangaea Ultima was connected to the global ocean Moana Katoa. Due to the northward contraction of Pangaea Ultima, however, this sea has become landlocked. With no way for this water to drain, the sea became saltier and saltier. Now, the Tiamat Sea is effectively a massive salt lake. Mangrove swamps have formed aroud the shores of this increasingly salty body of water.
The fish that live in this sea have either adapted to the increasing salinity or gone extinct. In lieu of fish, cephalopods have diversified to take many ecological niches in this vast sea. Marine reptiles and giant nematodes can be found here as well. Neosaurs may be found along the shores or in the mangrove swamps that ring the seas, and these may become prey to the marine life.
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