I did, sort of, in like five seconds.
en.wikipedia.org
In it, you can see the five officially listed ME events in blue then at the bottom, you will see the Precambrian Great Oxygenation Event. Then if you click on that entry, it takes you right here:
en.wikipedia.org
And if you read down a paragraph or two, you will see where they admit (noting in red):
"The sudden injection of toxic oxygen into an anaerobic biosphere may have caused the extinction of many existing anaerobic species on Earth [the only life in abundance at that time].
Although the event is inferred to have constituted a mass extinction, due in part to the great difficulty in surveying microscopic species' abundances, and in part to the extreme age of fossil remains from that time, the Great Oxidation Event is typically not counted among conventional lists of "great extinctions", which are implicitly limited to the Phanerozoic eon. In any case, isotope geochemical data from sulfate minerals have been interpreted to indicate a decrease in the size of the biosphere of >80% associated with changes in nutrient supplies at the end of the GOE.
In the above you will note:
- The event infers a MASS EXTINCTION from that far back.
- The experts simply ignore it in conventional lists because by their desired definition, they are looking at events only occurring during the Phanerozoic eon, which doesn't begin until the start of the Cambrian Explosion 550 million years ago where life as we know it today first got its start, consciously excluding the Proterozoic Eon and the roughly 2 billion years before where life existed, perhaps because life then was still essentially limited to just single cell organisms, but was life nevertheless.
- That the GOE mass extinction, whether they call it one or not resulted in a loss of more than 80% of the biosphere, which by any measure, IS a mass extinction!
So, put simply, the difference is merely a matter of misleading SEMANTICS to the casual reader, and rather than just read shit off a webpage and regurgitate it, I've gone beyond the text to correctly state that there was a SIXTH mass extinction event, which is simply not included in the conventional list by their own admission not because of WHAT happened, but simply because of WHEN.
And no matter when an extinction occurs, any event that takes out >80% of the biosphere is rightly one big whoop-ass of a MASS extinction event.
You're problem Crock is that whereas you are just a mere follower, reader and regurgitator, I'm a leader and an independent science thinker-analyst.
I'm right on scientific grounds and if someone printed that cows could fly, you'd just blindly accept and believe it.
Any other questions?