[Renfield]

Note the date of 35,000 years before present. This isn’t the same time as the great extinction of the P/H boundary, but it demonstrates that what is possible.

[Publius6961]

Note the date of 35,000 years before present. This isn’t the same time as the great extinction of the P/H boundary, but it demonstrates that what is possible.

As a non-professional in this field, I have no vested interest in defending or protecting a pet theory. And they are all theories.
What is possible is likely closer to the truth than present dogma. What we don't know is larger, by several orders of magnitude than what is known. I am convinced of that.

Undefined catastrophes have visited the earth in the past and will visit the earth in the future. We may never learn about all or even most of them.

As a human being, instinct in me hopes that the next will not occur before I go to my rewards.
But the curiosity in me hopes, subconsciously, that it would be the experience of a lifetime, and would dwarf all other scares of my life, real and imagined.

[blam]

These embedded particles are covered in detail in the book SunkenCiv has posted in post #7.

"The Cycle of Cosmic Catastrophes: Flood, Fire, and Famine in the History of Civilization"