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Yes that's true , you can find fossils of marine animals all over the North America and Eurasia that once purportedly formed submerged continent of Leurasia covered by Thetys Sea
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But , you're thinking of earth as you know it with clear separation of water from earth on the surface level . That's probably its latest version.
Before it came to be so differentiated it was full...

It's a hypothesis . There's no proof there was a supercontinent 'pangea' and many small patches of smaller continents that later submerged and are now resting on the vast ocean bottom.
The whole...