Me: What period is called 'The Great Dying'?
AI Overview: "The Great Dying" refers to the Permian-Triassic extinction event, which occurred approximately 252 million years ago. It marks the boundary dividing the Paleozoic and Mesozoic eras. [1, 2, 3]
This catastrophic event was Earth’s most severe known mass extinction, permanently wiping out around 90% of marine species and 70% of terrestrial vertebrate species. [1, 2]
It is widely attributed to massive volcanic eruptions in the Siberian Traps. These eruptions released massive amounts of carbon dioxide and triggered severe climate change, ocean acidification, and widespread oxygen depletion in the seas. [1, 2, 3]
Me: Did the period called 'The Great Dying' bring about more species?
AI Overview: The "Great Dying"—formally known as the Permian-Triassic extinction event—did not initially bring about more species. Instead, it nearly eradicated all life, wiping out up to \(95\%\) of marine species and \(70\%\) of land vertebrates. However, by emptying ecological niches, it paved the way for a massive evolutionary rebound and the rise of the dinosaurs. [1, 2, 3, 4, 5]
The catastrophic event, which occurred around \(252\) million years ago, was triggered by massive volcanic eruptions that caused intense global warming and ocean suffocation. [1, 2]
The Aftermath and Evolution
- A Blank Slate: Because previously dominant animals like large synapsids (mammal-like reptiles) and early marine life perished, the few surviving species suddenly had little competition for resources. [1, 2, 3]
- Adaptive Radiation: Over millions of years, these survivors diversified and evolved into entirely new forms. [1, 2]
- The Rise of Dinosaurs: In the Triassic period that followed, the descendants of the survivors—including early ancestors of mammals, birds, crocodiles, and dinosaurs—rapidly filled the empty habitats. [1, 2]
Me: How did the Permian-Triassic extinction bring about huge creatures and where did ...
AI Overview: The Permian-Triassic extinction (the "Great Dying," ~252 million years ago) triggered the evolution of huge creatures by causing a massive "ecological release." Wiping out 90%+ of species emptied ecosystems worldwide, allowing surviving lineages to rapidly diversify and grow to gigantic proportions without competition. [1, 2, 3, 4, 5]
Where Did the Giant Survivors Come From?
Before the Great Dying, the dominant land animals were synapsids (mammal-like reptiles), while early reptiles stayed small. After the extinction wiped out the apex predators, the survivors diversified in the newly opened space: [1]
- Archosaurs (The Reptile Lineage): Surviving diapsids rapidly grew larger and eventually evolved into the ruling class of the Mesozoic—including the first dinosaurs, crocodiles, and pterosaurs. [1]
- Cynodonts (The Mammal Lineage): Small-bodied mammal ancestors survived the catastrophe by hiding in burrows and quickly took over many empty ecological niches. [1, 2, 3, 4, 5]
How the Extinction Fueled Giant Growth
- Ecosystem Vacuums: Because so many large predators and herbivores perished, a select few surviving species exploded in both population and physical size to fill these newly available food and territorial resources. [1, 2, 3, 4]
- High-Oxygen and Climate Changes: Following the catastrophic volcanic eruptions in the Siberian Traps, the recovery period eventually produced a hot, humid, and heavily forested world. This hyper-productive environment, paired with shifting oxygen levels, promoted immense growth among both land and marine animals (like early ichthyosaurs). [1, 2, 3]
Me: If the Permian-Triassic extinction brought about the huge creatures ...
AI Overview: It is a common misconception that the Permian-Triassic extinction ("The Great Dying") favored large creatures. In reality, the event heavily favored small, adaptable, and burrowing survivors. The giant species could not survive the subsequent ecosystems because they lacked the food and environmental tolerance needed for the changing world. [1, 2, 3, 4, 5, 6]
Why Large Creatures Died Out
- Extreme Resource Demands: Massive animals required vast amounts of food and oxygen. During the extinction pulses, atmospheric oxygen plummeted and the food web collapsed, making it impossible to sustain huge bodies. [1, 2, 3, 4, 5]
- Hypercapnia and Warming: The massive volcanism (Siberian Traps) caused extreme global warming and ocean acidification. Larger creatures struggled to dissipate body heat or efficiently breathe in low-oxygen environments. [1, 2]
Why Smaller Survivors Thrived (Temporarily)
- Burrowing and Sheltering: Small, mammal-like ancestors (like Lystrosaurus) were able to hide in burrows, sheltering from lethal UV radiation (due to ozone depletion), extreme heatwaves, and toxic dust storms. [1, 2, 3, 4, 5]
- Low Metabolic Needs: Small animals required far less energy, meaning they could survive the initial years of collapsed ecosystems and lack of plant matter. [1, 2, 3]
The Aftermath and Ecosystem Shifts
- Ecosystems in the Early Triassic were volatile and lacked complex food webs.
- New lineages, such as early archosaurs (the ancestors of dinosaurs), were biologically better equipped to thrive in the hot, arid climates of the emerging Triassic Period.
- The survivors from the Permian eventually went extinct or were sidelined as a completely new suite of animals took over the planet. [1, 2, 3]
MY NOTE: Since the Bible says humans lived approximately 10 times longer from Creation and before The Flood during Noah's life, it is assumed animals did also. And reptiles continue to grow, not reaching maximum growth like humans (who appear to get shorter as they crouch in old age) ....reptiles we see now would perhaps be 10 times larger than we see now.
