Marine Life in Triassic & Jurassic / Why Life Recovered Slowly After Permian Extinction | GEO GIRL

The Triassic and Jurassic periods are the first two periods of the Mesozoic Era that from ~252 to 145 million years ago. Marine life was forever changed after the Great Dying, or the largest mass extinction of all time at the end of the Permian period ~252 million years ago. For example, Fusulinid foraminifera, corals, and trilobites had gone extinct. Rugose and tabulate corals were major reef builders in the Paleozoic Era, before the Mesozoic, but since they went extinct at the end of the Paleozoic, this forced new coral species to take over reef building in the Mesozoic Era, but the recovery of corals in this way took a very long time. In fact, many organisms that recovered after the Great Dying did so very slowly. The slow recovery of organisms after the Great Dying was due to additional mass extinctions in the Early Triassic. These additional extinction events were recorded by the fossil records of ammonoids and conodonts as well as C and O isotopes, and they were caused by global warming and ocean anoxia. But in the mid-Triassic, life was finally able to recover in a more stable climate and environment. Mesozoic marine life included hexocorals (or scleractinians), which became the major reef builders in the Mesozoic and have continued to play this role into the present, echinoids, bivalves, coccolithophores, ammonoids & belemnoids, and many vertebrates. Some of the vertebrates that thrived in the Mesozoic include ray-finned bony fish, sharks, marine reptiles that looked like sea monsters, frogs, and turtles. Unfortunately, at the end of the Triassic period, another mass extinction event occurred, which I talk about here:    • Late Triassic Mass Extinction Causes ...  

References: Earth System History: https://amzn.to/3v1Iy0G

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0:00 Timing of Triassic & Jurassic
0:52 Major Events in Triassic-Jurassic
2:11 Extinct after the Permian
3:50 Recoveries after the Permian
5:13 3 Mass Extinctions in Early Triassic
6:57 Cause of these Extinctions
10:12 Completely New Reefs
12:04 Modernization of Ocean Floor
12:32 Invention of Chalk
13:26 Predatory Invertbrates
14:22 Fish & Sharks Modernized
15:35 Sea Monsters
17:58 Croccodiles
18:30 Frogs & Turtles
19:10 Another Mass Extinction
20:00 Related Videos & References

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