The Entire Triassic Age: Emergence and Decline of the Dinosaurs | Primeval Feature [4K]

In this video we follow the complete Triassic Period, from the aftermath of Earth's largest mass extinction about 252 million years ago to the end-Triassic crisis around 201 million years ago. We begin with the supercontinent Pangea and the surrounding Panthalassa Ocean and Tethys Sea, and we see how their size created hot, dry interiors, vast deserts, seasonal rivers and limited coastal rainfall. We trace how plants such as ferns, seed ferns, conifers, cycads, and ginkgo relatives slowly returned and rebuilt soils, wetlands, and forests. We then move through the reptiles that dominated the period: crocodylian-line archosaurs like Postosuchus, armored planteating aetosaurs, river-dwelling phytosaurs, long-necked Tanystropheus, rhynchosaurs, early turtles, flying pterosaurs, and marine groups such as ichthyosaurs, nothosaurs, and placodonts. We discover that the first true dinosaurs, including Eoraptor, Herrerasaurus, and Saturnalia, were mostly small and did not immediately dominate the land. We also look at the first mammals and early pterosaurs. Finally we examine the end-Triassic extinction, driven by massive eruptions of the Central Atlantic Magmatic Province. We see how volcanic carbon dioxide, sulfur, ash, ocean acidification, and low oxygen damaged reefs, ammonoids, conodonts, plants, and many reptiles. We close with the survivors—especially the dinosaurs—entering the Jurassic and filling the empty habitats left by the crisis. One detail worth knowing about the Triassic is the Carnian Pluvial Episode, a roughly two-million-year wet interval around 234 to 232 million years ago. According to a study published in Nature Communications, this was not a random climate quirk but the result of repeated volcanic pulses that flooded the atmosphere with carbon dioxide and temporarily broke the Triassic's prevailing aridity. Forests spread, humidity rose, and the dominant herbivores of the time collapsed. Dinosaurs, still minor players, stepped into the gap and diversified rapidly. That episode is now seen as the real turning point in dinosaur history, well before the end-Triassic crisis gave them the world outright. As for what finally cleared the stage, the CAMP eruptions were staggering in scale. Research published in the Proceedings of the National Academy of Sciences found that in its initial phase, CAMP basalts released more than 500 times the sulfur of the historic Laki eruption in Iceland, in rapid repeated pulses. The resulting volcanic winters hit land animals hard and fast, while the longer accumulation of carbon dioxide drove ocean acidification that dismantled marine food webs. The whole volcanic province covered an estimated 10 million square kilometers across what are now four continents, as it split Pangea apart. A study in Scientific Reports using high-precision uranium-lead dating confirmed that underground magmatic activity was underway roughly 100,000 years before the first surface flows, meaning the crisis had a slow buildup before the killing pulse arrived. Sources:, Dinosaur diversification linked with the Carnian Pluvial Episode | Nature Communications (Nature), Correlation of sub-centennial-scale pulses of initial CAMP lavas and the end-Triassic extinctions | PNAS (Pnas), New U-Pb geochronology for the Central Atlantic Magmatic Province | Scientific Reports (Nature)