I still subscribe to the planet x theory.

But something here dont really add up. Im not sure where hes grabbing 42000 and then dividing it by 6. Why lol.

The mass extinctions are over a much larger time span than that...

First, we must be clear on what we mean by "mass extinction". Extinctions are a normal part of evolution: they occur naturally and periodically over time.

There’s a natural background rate to the timing and frequency of extinctions: 10% of species are lost every million years, 30% every 10 million years, and 65% every 100 million years.It would be wrong to assume that species going extinct is out of line with what we would expect. Evolution occurs through the balance of extinction – the end of species – and speciation – the creation of new ones.

Extinctions occur periodically at what we would call the "background rate". We can therefore identify periods of history when extinctions were happening much faster than this background rate – this would tell us that there was an additional environmental or ecological pressure creating more extinctions than we would expect.

However, mass extinctions are periods with much higher extinction rates than normal. They are defined by both magnitude and rate. Magnitude is the percentage of species that are lost. Rate is how quickly this happens. These metrics are inevitably linked, but we need both to qualify as a mass extinction. In a mass extinction, at least 75% of species go extinct within a relatively (by geological standard) short period of time. Typically less than two million years.

There have been five mass extinction events in Earth’s history, at least since 500 million years ago. We know very little about extinction events in the Precambrian and early Cambrian earlier, which predate this.4 These are called the "Big Five" for obvious reasons.

In the chart, we see the timing of events in Earth’s history.5 It shows the changing extinction rate (measured as the number of families that went extinct per million years). Again, note that this number was never zero: background extinction rates were low – typically less than 5 families per million years – but ever-present.

We see the spikes in extinction rates marked as the five events:

End Ordovician (444 million years ago; mya)

Late Devonian (360 mya)

End Permian (250 mya)

End Triassic (200 mya) – many people mistake this as the event that killed off the dinosaurs. But in fact, they were killed off at the end of the Cretaceous period – the fifth of the "Big Five".

End Cretaceous (65 mya) – the event that killed off the dinosaurs. Finally, at the end of the timeline, we have the question of what will come. Perhaps we are headed for a sixth mass extinction. But we are currently far from that point.

hell 42000 years ago.... woulda been pretty cold, but stable.

The Last Interglacial was a period of the Earth's geological history (between 130 000 and 115 000 years BP) characterized by a climate warmer than today, with a higher global sea level and smaller ice-sheets. The current Holocene interglacial began at the end of the Pleistocene, about 11,700 years ago.

So I have no idea where he is pulling 42k from.