Were there dinosaurs in this interval?

No. Dinosaurs didn't appear until the Late Triassic, long after this interval ended. These periods were dominated by marine invertebrates, early fish, amphibians, and early reptiles.

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Ordovician to Permian

485-252 million years ago

The Ordovician through Permian periods span most of the Paleozoic Era, a vast stretch of time when life was establishing itself in the seas and eventually colonizing land. This was hundreds of millions of years before the first dinosaur.

Fun Facts

✓The Ordovician Period saw the first vertebrates with jaws evolve.
✓Land plants first colonized terrestrial environments during the Ordovician-Silurian transition.
✓By the end of this interval, the first forests had appeared and the land was becoming recognizable.

Questions About the Early Paleozoic

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