The Cretaceous Sea is an inland sea located in Kansas during the Late Cretaceous, 80 million years ago.
The crew of a fishing boat become trapped in this sea after going through an anomaly. The ARC team later goes through in their own boat to try to rescue them. They are repeatedly attacked by a trio of adult Mosasaurs, which also attack the fishing boat once the team finds it. Connor is also attacked by a swarm of vicious, piranha-like Enchodus when he accidentally falls into the water. The team also encounters other creatures such as a pod of Styxosaurus, an Archelon, and a flock of Hesperornis to name a few.
Despite how peaceful and tranquil it appears from above water, this sea houses a menagerie of ferocious and deadly marine predators in the depths below: such as mosasaurs, plesiosaurs, sharks, and deadly swarming fish.
- It is the third prehistoric and third Cretaceous world seen in Primeval Resurrected, and the first aquatic world seen in Primeval Resurrected.